C. F. Keil and Franz Delitzsch on Exodus 34:27

Exo 34:27

Moses was to write down these words, like the covenant rights and laws that had been given before (Exo 24:4, Exo 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).