Moses
Exodus 34:27ESV·traditional attribution

And the LORD said to Moses, “Write these words, for in accordance with these words I have made a covenant with you and with Israel.”

Matthew Henry Presbyterian @wholebiblehenry

Here is a repetition of several appointments made before, especially relating to their solemn feasts. When they had made the calf, they proclaimed a feast in honour of it; now, that they might never do so again, they are here charged with the observance of the feasts which God had instituted.

Commenting on Exodus 34:18-27

John Gill Reformed Baptist @doctorgill

And when Aaron and all the children of Israel saw Moses,.... Who very probably met him at the bottom of the mount; these Israelites with Aaron were the princes, as Aben Ezra seems rightly to interpret it, and as appears from the following verse; for Moses could not well be seen by the whole body of the people at once, upon his descent from the...

Jamieson-Fausset-Brown Reformed @jfbcommentary

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