Exodus 23:19

23:19 The first of the firstfruits of your soil you must bring to the house of the Lord your God.

“You must not cook a young goat in its mother’s milk.

Exodus 34:4

34:4 So Moses cut out two tablets of stone like the first; early in the morning he went up to Mount Sinai, just as the Lord had commanded him, and he took in his hand the two tablets of stone.