'Sons of Israel' in the Bible

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."

So Moses numbered all the firstborn from the sons of Israel just as the LORD commanded him.

"Separate the descendants of Levi in place of all the firstborn sons of Israel and the livestock of the descendants of Levi in place of their livestock. The descendants of Levi belong to me, since I am the LORD.