Leviticus 19:14

 Leviticus 19:14 MKJV  You shall not curse the deaf, nor put a stumbling-block before the blind, but shall fear your God. I am Jehovah.

Deuteronomy 27:18 LITV  Cursed is he who makes the blind to wander out of the way! And all the people shall say, Amen!

"He who is capable of doing this, must have a heart cased with cruelty. The spirit and design of these precepts are, that no man shall in any case take advantage of the ignorance, simplicity, or inexperience of his neighbor, but in all things do to his neighbor as he would, on a change of circumstances, that his neighbor should do to him." - Adam Clarke's Commentary of the Bible

"Under these two particulars are manifestly forbidden all injuries done to such as are unable to right or defend themselves; of whom God here takes the more care, because they are not able to secure themselves." - Joseph Benson's Commentary on the Old and New Testaments

"They were not to do an injury to an infirm person: neither to ridicule or curse the deaf, who could not hear the ridicule or curse, and therefore could not defend himself (Psalm 38:15); nor “to put a stumblingblock before the blind,” i.e., to put anything in his way over which he might stumble and fall (compare Deuteronomy 27:18, where a curse is pronounced upon the man who should lead the blind astray). But they were to “fear before God,” who hears, and sees, and will punish every act of wrong" - Keil & Delitzsch Commentary on the Old Testament

This is pretty obvious. God COMMANDS them not to bully those who are handicapped or disabled. The Israelites were commanded not make things harder for the handicapped. The Israelites were commanded not to ridicule, mock and laugh at the handicapped. Some translations use the word, "revile" which means any kind of verbal abuse. God commands the Israelites not to take advantage of the handicapped. God doesn't use the word "handicapped". He uses "deaf" and "blind". Although I'm sure God encompasses all of those who are disabled or handicapped, I wonder if He also had in mind those who are spiritually deaf and blind.

"deaf" - che^re^sh - H2795
Strong's Hebrew and Greek Dictionary
From H2790; deaf (whether literal or spiritual): - deaf.
H2790 - cha^rash
A primitive root; to scratch, that is, (by implication) to engrave, plough; hence (from the use of tools) to fabricate (of any material); figuratively to devise (in a bad sense); hence (from the idea of secrecy) to be silent, to let alone; hence (by implication) to be deaf (as an accompaniment of dumbness): -    X altogether, cease, conceal, be deaf, devise, ear, graven, imagine, leave off speaking, hold peace, plow (-er, -man), be quiet, rest, practise secretly, keep silence, be silent, speak not a word, be still, hold tongue, worker.
Brown-Driver-Briggs Hebrew Dictionary
1) deaf
Part of Speech: adjective

"blind" - H5787 - 'ivve^r
Strong's Hebrew and Greek Dictionaries
Intensive from H5786; blind (literally or figuratively): - blind (men, people).
H5786 - 'a^var
A primitive root (rather denominative from H5785 through the idea of a film over the eyes); to blind: - blind, put out.
Brown-Driver-Briggs Hebrew Dictionary
1) (Piel) to blind, make blind, put out the eyes of
Part of Speech: verb

The Israelites were not to contribute to the spiritual deafness and blindness of those pagan nations around them. We, also, should be very careful that we are not putting obstacles in the way of the lost. Do they see us behaving like the world, being hypocrites? Is that putting a stumbling block in front of them on their pathway to God? Or do we "revile" the lost, giving them the wrong idea about Jesus and His love? Making them feel as though they are not worthy to be loved by God, saved? If they are deaf and blind to God's love and the gospel, are we trying to remove the spiritual blinders and unstop the spiritual ears with our actions and testimonies or are we adding more layers of blinders and more cotton to their ears? When I speak about the unsaved, the lost, is it pointing their towards Christ or are my words and body language obstructing them from Christ?

Many times, in our human frustration, fear, anger, we get out of balance and become more of an obstruction to Christ for the lost. I.e. if they ever get saved, it's despite me instead of because of me. Do they have to go around me to get to God or am I pointing the way to Jesus? I'd rather be a welcome mat to Jesus than a barred door.

I think of some protesters who harangue, revile and jeer at the lost on street corners, abortion clinics, etc. They have some very mean signs. I understand how frustrating it can get and anger can get the best of you. But we should be in balance and should be pointing the way to Jesus. I'm not saying we shouldn't say sin is sin or that we should pat sinners on the head and carry them to hell in a handbasket of "love". But we should always keep in balance, and be loving and respectful when we tell the truth.

Then there are times we Christians can be hypocrites. We say one thing and do another. We demand perfection for everyone else but expect mercy for ourselves. We show out, we show off and then we act pious on Sundays. Someone from the world would call us hypocrites. Are we not throwing stumblingblocks in front of the lost?

Or do we put stumblingblocks in front of our fellow brothers and sisters in Christ? Do we ever judge them too harshly or put such unreal expectations on them they feel they never measure up and therefore God doesn't love them? It's very easy for legalism to take over in a church as a method of control. Before we know it, we have people in the church so bound up in keeping rules, laws, procedures and policies they can't breath. Are we hindering our brothers and sisters or helping them to God? Do we present an angry God or a loving, forgiving God? Do we show them how to have relationship with God or to fear God (fear as in an unhealthy and hindering way)? Are we trying to control people or releasing them to God?

I have to think of pastors who sometimes resort to beating their sheep rather than blessing their sheep. But it's certainly not just pastors. Do we do this to our own family? Do we expect our spouse, children, parents, siblings to walk this tight, narrow, controlled path to OUR satisfaction? We should point someone in the right direction but we cannot force them to comply and follow it. There is a balance. God always knows when to confront and when to cajole. God always knows when to show judgment and when to show mercy. God always knows the balance. Of course, we are NOT God and we don't know the right thing to say and do at the right time UNLESS we pray about it and get God's wisdom on a matter. We must also check ourselves and make sure we don't have a log in our own eye. And we must always have a humble, loving attitude. If you feel we are losing your balance, losing our temper, then shut up and walk away until you regain your composure. PRAY! Dialogue with God. Let Him and His Word be your guide.

Romans 14:11-13 ESV  for it is written, “As I live, says the Lord, every knee shall bow to me, and every tongue shall confess to God.”  12  So then each of us will give an account of himself to God.  13  Therefore let us not pass judgment on one another any longer, but rather decide never to put a stumbling block or hindrance in the way of a brother.

Luke 17:2 ESV (Jesus speaking) It would be better for him if a millstone were hung around his neck and he were cast into the sea than that he should cause one of these little ones to sin.

Another thing to notice about this verse is God knows what you do. The deaf may not hear you making fun of him. The blind may not see it was you who put the stumblingblock in front of him... but God does! "But you shall fear your God: I am the Lord!" They may not can take care of themselves and they may not know who afflicted them, but God will take care of them and will take care of you for your malice.