19 All that openeth the matrix is mine; and every firstling among thy cattle, whether ox or sheep, that is male.

20 But the firstling of an ass thou shalt redeem with a lamb: and if thou redeem him not, then shalt thou break his neck. All the firstborn of thy sons thou shalt redeem. And none shall appear before me empty.

25 Thou shalt not offer the blood of my sacrifice with leaven; neither shall the sacrifice of the feast of the passover be left unto the morning.

26 The first of the firstfruits of thy land thou shalt bring unto the house of the Lord thy God. Thou shalt not seethe a kid in his mother’s milk.

God continues to re-establish His original commandments, now detailing the requirement that every firstborn of their flocks was to be an offering to the Most High. These instructions are all things that we have heard before.

It is interesting to note that the laws that God is re-establishing were originally given clear back at the start of Israel’s journey out of Egypt. These are not the instructions that He gave the first time Moses met with Him in Mount Sinai, which included the ten commandments, nor is it the instructions that He gave during Moses’s second visit to the mountain, which included the details for building the tabernacle.

Of course, we will see throughout the rest of the Old Testament that the Israelites observed all of the laws given at all of the prior times of instruction, even if we don’t hear them all being reimplemented here. Moses was up in the mountain this third time for another forty days and forty nights, so it is entirely possible that the Lord did, in fact, restate all of the previous commands during this visit, even if only the first portion of His words have been transcribed into our present-day Bible.