Numbers 9:2-5

2‘The Israelites must eat the Passover meal at the proper time. They must eat it as the rules about it say.

3The proper time is during the evening of the 14th day of this month. It is when it starts to become dark. That is when you must eat it. You must obey all its rules and its laws.’

4So Moses told the Israelites that they should eat the Passover.

5So they ate the Passover in the first month, on the 14th day when it started to become dark. That was in the Sinai desert. The Israelites did everything that the Lord had said to Moses about it.