Numbers 9:5-7

International Standard Version

⁵ They observed the Passover on the fourteenth day of the first month at twilight, in the Wilderness of Sinai. The Israelis did everything that the Lord had commanded through Moses.

Special Passover Rules

⁶ But there were men who couldn’t observe the Passover that day because they had come in contact with a corpse. That very day, they approached Moses and Aaron ⁷ and asked, “Why can’t we bring an offering to the Lord at the appointed time among the Israelis, even though we are unclean because we came in contact with a corpse?”