Exodus 12:3

12:3 Tell the whole community of Israel, ‘In the tenth day of this month they each must take a lamb for themselves according to their families – a lamb for each household.

Exodus 12:6

12:6 You must care for it until the fourteenth day of this month, and then the whole community of Israel will kill it around sundown.

Numbers 9:13

9:13 But the man who is ceremonially clean, and was not on a journey, and fails to keep the Passover, that person must be cut off from his people. Because he did not bring the Lord’s offering at its appointed time, that man must bear his sin.