(Verse 31) - He wondered  - What particularly attracted his attention was the fact that the bush was not consumed, (Exo. 3:2-3).

The voice of the Lord - Yahweh spake to him from the midst of the bush. He did not see him within the midst of the burning. He merely heard a voice.

(Verse 32) - Saying, I am the God  - See Matt. 22:32.

Then Moses trembled - (Exo. 3:6).  And who would not fear at such a sight, and such a message?  There are many today who boldly, arrogantly proclaim their affinity to God.  Yet, there is no fear of Him before their eyes!  There is no trembling before Him, because there is no real perception of Him as a great and mighty God Who must be feared!  To know God rightly is to fear Him for Who He is!  Certainly, the Gospel removes, or tempers a measure of that fear, but the fear of God must be present or the one in question does not know God!

(Verse 33) - Then said the Lord  - In Exo. 3 this is introduced in a different order, as being spoken “before” God said “I am the God,” etc.

Put off thy shoes  - (Exo. 3:5). To put off the shoes; or sandals, was an act of reverence. The ancients were especially not permitted to enter a temple or holy place with their shoes on. Indeed, it was customary for the Jews to remove their shoes whenever they entered any house as a mere matter of civility. This is still a custom in many eastern homes today.  (Compare ohn 13:5. See Jos. 5:15).  One writer observed:“The same custom, growing out of the same feeling, is observed among the Eastern nations at the present day. The Arabs and Turks never enter the mosques without putting off their shoes. They exact a compliance with this rule from those of a different faith who visit these sacred places. Though, until a recent period, the Muslims excluded Christians entirely from the mosques, they now permit foreigners to enter some of them, provided they leave their shoes at the door, or exchange them for others which have not been defiled by common use.”

Is holy ground - Is rendered sacred by the symbol of the divine presence. We should enter the sanctuary, the place set apart for divine worship, not only with reverence in our hearts, but with every “external” indication of veneration. Solemn awe and deep seriousness become the place set apart to the service of God. (Compare Eccl. 5:1).  We need to remember that the ground was hallowed by the presence of God, and only the presence of God.  There was nothing holy about the ground itself, nor was the place particularly special for any reason.  Neither did the “holiness” persist after the presence of God departed.  Holiness and the fear and reverence that should accompany the presence of God is a function of His Being, and nothing else.  We fear and hallow God Himself, not that which He has touched or those places where He has been.  To reverence a place or a thing is a form of idolatry and superstition that is unacceptable to real Christianity.

(Verse 34) - I have seen  - The repetition of this word is in accordance with the usage of the Hebrew writers when they wish to represent anything emphatically.  This is not to imply that there was a time when He did not see it.  This is not saying that He came to see it recently, or that He was now aware of something that He had not been aware of earlier.  It simply states that He IS aware of it, and that He is now ready to do something about it.

Their groaning - Under their oppressions.  There is a particularly touching idea here.  This is a function of the love and the compassion of God.  God is not sending a deliverer solely because of His own plan and purpose.  He is concerned with the pain and suffering that His people are undergoing and He is concerned that their suffering be relieved.  This is a great comfort to us as we seek to serve God.  We ought not think of the workings of God as a purely mechanical thing.  He does not do things for entirely dispassionate reasons, or simply for reasons that have to do with His own plan and purpose.  Rather, He is concerned with His people, and He takes action for reasons that have to do with their well-being and benefit as well!  This is a major reason why prayer is what it is.  We pray because we believe God hears and because we believe that He is concerned about us and desires to do something to assuage our situation!

Am come down - This is spoken in accordance with human conceptions. It means that God was about to deliver them.  Again, there is no implication that god was not there already, it is simply an accommodation to the human condition - to make the situation more understandable to Moses and to explain God's actions in human terms.

I will send thee  - This is a mere summary of what is expressed at much greater length in (Exo. 3:7-10).