And the Lord spake unto Moses Continued to speak unto him, and give him the reason of his appointing the Levites to minister to the priests and serve the tabernacle:
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I claim the Levites from the Israelites in place of all the oldest males who open an Israelite womb. The Levites are mine
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because all the oldest males are mine. When I killed all the oldest males in the land of Egypt, I reserved for myself all the oldest males in Israel, both humans and animals. They are mine; I am the LORD.