Numbers 9:3-6 New Living Translation (NLT)

3. at twilight on the fourteenth day of the first month. Be sure to follow all my decrees and regulations concerning this celebration.”

4. So Moses told the people to celebrate the Passover

5. in the wilderness of Sinai as twilight fell on the fourteenth day of the month. And they celebrated the festival there, just as the lord had commanded Moses.

6. But some of the men had been ceremonially defiled by touching a dead body, so they could not celebrate the Passover that day. They came to Moses and Aaron that day

Numbers 9