Exodus 34:27

²⁵Thou shalt not offer the blood of my sacrifices with leaven, neither shall the sacrifices of the feast of the Passover remain till the morning.

²⁶The firstfruits of thy land shalt thou put into the house of the Lord thy God: thou shalt not boil a lamb in his mother’s milk.

— Exodus 34:27 —

²⁸And Moses was there before the Lord forty days, and forty nights; he did not eat bread, and he did not drink water; and he wrote upon the tables these words of the covenant, the ten sayings.

²⁹And when Moses went down from the mountain, there were the two tables in the hands of Moses—as then he went down from the mountain, Moses knew not that the appearance of the skin of his face was glorified, when God spoke to him.