In Numbers 3, God took the Levites for Himself in place of whom?

Answer: Every firstborn Israelite

God said, "I have taken the Levites from among the children of Israel in place of every firstborn Israelite... The Levites belong to Me."

““Behold, I have taken the Levites from among the children of Israel in place of every firstborn Israelite from the womb. The Levites belong to Me,”— Numbers 3:12 (BSB)