Numbers 9:1-6

The Passover Celebrated

1And the  Lord spoke to Moses in the wilderness of Sinai, ain the first month of the second year after they had come out of the land of Egypt, saying, 2“Let the people of Israel keep the Passover at its appointed time. 3 bOn the fourteenth day of this month, at twilight, you shall keep it at its appointed time; according to all its statutes and all its rules you shall keep it.” 4So Moses told the people of Israel that they should keep the Passover. 5And they kept the Passover in the first month, on the fourteenth day of the month, at twilight, in the wilderness of Sinai; according to all that the  Lord commanded Moses, so the people of Israel did. 6And there were certain men who were cunclean through touching a dead body, so that they could not keep the Passover on that day, and dthey came before Moses and Aaron on that day.
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