Charles Ellicott Commentary Exodus 24:3

"And Moses came and told the people all the words of Jehovah, and all the ordinances: and all the people answered with one voice, and said, All the words which Jehovah hath spoken will we do." — Exodus 24:3 (ASV)

Moses ... told the people all the words of the Lord. —Moses gave them an outline of the legislation which he subsequently committed to writing (Exodus 24:4) and formed into “the Book of the Covenant” (Exodus 24:7). Its general purport and main points were communicated, but probably not all its details. Otherwise it would scarcely have been necessary to read the contents of the book to them. The people willingly gave their assent, feeling the laws to be holy, just, and good, and not yet knowing how difficult they would find it to render a perfect obedience.