Exodus 12:5; Exodus 12:48; Exodus 13:12; Exodus 13:15

Exodus 12:5

5 Your lamb shall be without blemish, a male of the first year: ye shall take it out from the sheep, or from the goats:

Exodus 12:48

48 And when a stranger shall sojourn with thee, and will keep the passover to the LORD, let all his males be circumcised, and then let him come near and keep it; and he shall be as one that is born in the land: for no uncircumcised person shall eat thereof.

Exodus 13:12

12 That thou shalt set apart unto the LORD all that openeth the matrix, and every firstling that cometh of a beast which thou hast; the males shall be the LORD'S.

Exodus 13:15

15 And it came to pass, when Pharaoh would hardly let us go, that the LORD slew all the firstborn in the land of Egypt, both the firstborn of man, and the firstborn of beast: therefore I sacrifice to the LORD all that openeth the matrix, being males; but all the firstborn of my children I redeem.