Write thou these words - Either a transcript of the whole law now delivered, or the words included from Exodus 34:11 to Exodus 34:26. God certainly wrote the ten words on both sets of tables. Moses either wrote a transcript of these and the accompanying precepts for the use of the people, or he wrote the precepts themselves in addition to the ten commandments which were written by the finger of God. See Clarke on Exodus 34:1 (note). Allowing this mode of interpretation, the accompanying precepts were, probably, what was written on the back side of the tables by Moses; the ten commandments, what were written on the front by the finger of Jehovah: for we must pay but little attention to the supposition of the rabbins, that the letters on each table were cut through the stone, so as to be legible on each side. See Clarke on Exodus 32:15 (note).

And the Lord said unto Moses,.... Being still with him on the mount:

write thou these words; expressed in the preceding verses, from Exodus 34:11, as he before had written in a book all those laws, contained in Exodus 21:1 called the book of the covenant, Exodus 24:4 and which perhaps might be destroyed, as well as the two tables were broken; and therefore upon the renewal of the covenant here, there is a repetition made of the principal laws before given, which are ordered also to be written in a book, which may very well be called by the same name, since it follows:

for after the tenor of these words I have made a covenant with thee and with Israel, with Moses, as their representative and mediator, and with them represented by him: what is above related carries in it the form of a covenant between them, God having declared on his part what he would do for them, and what laws and rules he required to be observed on their part; which Moses assented to in their name, and was ordered to write them down, that he might repeat them to them.

Moses was to write down these words, like the covenant rights and laws that had been given before (Exodus 24:4, Exodus 24:7), because Jehovah had concluded the covenant with Moses and Israel according to the tenor of them. By the renewed adoption of the nation, the covenant in ch. 24 was eo ipso restored; so that no fresh conclusion of this covenant was necessary, and the writing down of the fundamental conditions of the covenant was merely intended as a proof of its restoration. It does not appear in the least degree "irreconcilable," therefore, with the writing down of the covenant rights before Knobel).

And the LORD said unto Moses, Write thou these words: for after the tenor of these words I have made a covenant with thee and with Israel.

27, 28. And the Lord said unto Moses, Write thou these words-that is, the ceremonial and judicial injunctions comprehended above (Ex 34:11-26); while the rewriting of the ten commandments on the newly prepared slabs was done by God Himself (compare De 10:1-4).

34:18-27 Once a week they must rest, even in ploughing time, and in harvest. All worldly business must give way to that holy rest; even harvest work will prosper the better, for the religious observance of the sabbath day in harvest time. We must show that we prefer our communion with God, and our duty to him, before the business or the joy of harvest. Thrice a year they must appear before the Lord God, the God of Israel. Canaan was a desirable land, and the neighbouring nations were greedy; yet God says, They shall not desire it. Let us check all sinful desires against God and his glory, in our hearts, and then trust him to check all sinful desires in the hearts of others against us. The way of duty is the way of safety. Those who venture for him never lose by him. Three feasts are here mentioned: 1. The Passover, in remembrance of the deliverance out of Egypt. 2. The feast of weeks, or the feast of Pentecost; added to it is the law of the first-fruits. 3. The feast of in-gathering, or the feast of Tabernacles. Moses is to write these words, that the people might know them better. We can never be enough thankful to God for the written word. God would make a covenant with Israel, in Moses as a mediator. Thus the covenant of grace is made with believers through Christ.