You can’t escape the responsibility of tomorrow by evading it today. (Abraham Lincoln)
Moses, Aaron, and his sons were to make sure that the Israelites worshiped in the proper way (vv. 38-41). So they obeyed the LORD and counted the Levites by their clans. Here are the requirements made of the Levites for the first-born:
I am not the first-born in my family but this does not excuse me from having a responsibility to those who are new in the faith. I need to always have someone who is discipling me and I always need to be discipling someone else.
Those who were to camp before the tabernacle on the east, before the tent of meeting toward the sunrise, were Moses and Aaron and his sons, guarding the sanctuary itself, to protect the people of Israel. And any outsider who came near was to be put to death. All those listed among the Levites, whom Moses and Aaron listed at the commandment of the LORD, by clans, all the males from a month old and upward, were 22,000. And the LORD said to Moses, "List all the firstborn males of the people of Israel, from a month old and upward, taking the number of their names. And you shall take the Levites for me--I am the LORD--instead of all the firstborn among the people of Israel, and the cattle of the Levites instead of all the firstborn among the cattle of the people of Israel." So Moses listed all the firstborn among the people of Israel, as the LORD commanded him. And all the firstborn males, according to the number of names, from a month old and upward as listed were 22,273. And the LORD spoke to Moses, saying, "Take the Levites instead of all the firstborn among the people of Israel, and the cattle of the Levites instead of their cattle. The Levites shall be mine: I am the LORD. And as the redemption price for the 273 of the firstborn of the people of Israel, over and above the number of the male Levites, you shall take five shekels per head; you shall take them according to the shekel of the sanctuary (the shekel of twenty gerahs), and give the money to Aaron and his sons as the redemption price for those who are over." So Moses took the redemption money from those who were over and above those redeemed by the Levites. From the firstborn of the people of Israel he took the money, 1,365 shekels, by the shekel of the sanctuary. And Moses gave the redemption money to Aaron and his sons, according to the word of the LORD, as the LORD commanded Moses.
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Numbers 1:1-54Numbering the Soldiers
Numbers 2:1-34Organizing the Tribes
Numbers 3:1-37The Levites Assignments
Numbers 3:38-51The Levites substitution for the firstborn
Numbers 4:1-49The Levitical census and duties
Numbers 5:1-31The peoples need for holiness
Numbers 6:1-27A separated people