'Firstborn Males' in the Bible

Then the Lord said to Moses, "Number all the firstborn males of the Israelites from a month old and upward, and take the number of their names.

And take the Levites for me -- I am the Lord -- instead of all the firstborn males among the Israelites, and the livestock of the Levites instead of all the firstborn of the livestock of the Israelites."

So Moses numbered all the firstborn males among the Israelites, as the Lord had commanded him.

And all the firstborn males, by the number of the names from a month old and upward, totaled 22,273.

"Take the Levites instead of all the firstborn males among the Israelites, and the livestock of the Levites instead of their livestock. And the Levites will be mine. I am the Lord.

And for the redemption of the 273 firstborn males of the Israelites who exceed the number of the Levites,

From the firstborn males of the Israelites he collected the money, 1,365 shekels, according to the sanctuary shekel.

For all the firstborn males among the Israelites are mine, both humans and animals; when I destroyed all the firstborn in the land of Egypt I set them apart for myself.

The firstborn of every womb which they present to the Lord, whether human or animal, will be yours. Nevertheless, the firstborn sons you must redeem, and the firstborn males of unclean animals you must redeem.