Exodus 12:48

And when a stranger shall sojourn with thee, e.] Who by so doing became a proselyte of the gate, he observing the commands of the sons of Noah:

and will keep the passover of the Lord is desirous of being admitted to that ordinance:

let all his males be circumcised, and then let him come near, and keep it: first himself, and then all his male children and male servants, and then, and not till then, he might approach to this ordinance, and observe it; for by this means he would become a proselyte of righteousness, and in all respects as an Israelite, or son of Abraham, as it follows:

and he shall be as one that is born in the land; a native and proper inhabitant of Canaan, enjoying all the privileges and immunities of such:

for no uncircumcised person shall eat thereof; these laws and rules concerning those persons that were to eat of the passover are such as were to be observed in all successive generations, to the coming of Christ; and were the rather necessary to be given now, because of the mixed multitude who now came up with the children of Israel out of Egypt.