And because of this: (Ex. 23:19) The ‘first’ (reishyt) of the fruits of your land, you shall bring to the house of Y”Y ELoQeYKha. And similarly, with ‘the first’ of goats and sheep. It is this that is written: (Deut. 18:4)... and the first of the fleece of your flock, you shall give to Him. And next to:... the first of the first fruits of your land... etc., it is written (Ex. 23:19)... do not cook a kid in its mother’s milk... What is one to do with the other?
Arose Rabbi Shim’on upon his feet. He opened with a loud voice and said: ‘Elijah! Elijah! Descend here with permission of your Master, and enlighten the eyes of these elders, on that matter, so that they should not come to eat meat with milk!’