Exodus 23:19

Thou shalt not seethe, etc.] This prohibition may be intended to preserve the natural instinct of humanity: cp. Deuteronomy 22:6; Deuteronomy 22:7. But it more probably refers to a superstitious practice of using milk prepared in this way to sprinkle fields, as a charm against unfruitfulness: see Deuteronomy 14:21, where the prohibition is connected with the law of unclean meats. On account of this law, the Jews to this day abstain from mixing meat and milk in the same dish; nor will they partake of the one, except at a considerable interval after the other.

20-33. The Book of the Covenant closes with an exhortation in which a promise is made of God's presence, guidance, and help in overcoming their enemies, of wide dominion, and of material prosperity, on condition that they serve Jehovah alone and make no covenant with the heathen nations or their gods.