Leah's sons were Reuben (Jacob's first-born), Simeon, Levi, Judah, Issachar, and Zebulun.

The sons of Aaron were Nadab the first-born, Abihu, Eleazar, and Ithamar

"I'm taking the descendants of Levi for myself from among the Israelis in place of every first-born who opens the womb. The descendants of Levi belong to me

because all the first-born belong to me. When I destroyed all the firstborn in the land of Egypt, I consecrated all the first-born in Israel for myself from human beings to livestock. They belong to me, since I am the LORD."

Later the LORD instructed Moses: "Number all the first-born males of Israel from a month old and above and list their names.

Separate the descendants of Levi for me since I am the LORD in place of all the first-born sons of Israel. Also separate the livestock of the descendants of Levi in place of all the firstborn of the livestock of Israel."

All the first-born males according to the list of their names from a month old and above numbered 22,273.

You are to pay a ransom for the 273 first-born Israelis who exceed the census number of the descendants of Levi,

"Were you the first personto be born? Were you brought forth before the hills were made?