He said to him: ‘Most certainly, that is how it is. But this mystery is made known through this verse: (Gen. 1:24)... Let the earth bring forth the ‘living soul’ (nephesh) ḥayah, of each creature to its species... For even though they are of the side of purity, they are all male and female, and they are pairs, and one who takes from that which is not of his species type about that subsequent child that is composed of both-of-them, it is stated: (Ex. 23:19) do not cook a kid in its mother’s milk.’