Numbers 9:13-14

13But if anyone who is clean and is not on a journey fails to keep the Passover, that person shall be cut off from his people because he did not bring the Lord's offering at its appointed time; that man shall bear his sin.

14And if a stranger sojourns among you and would keep the Passover to the Lord, according to the statute of the Passover and according to its rule, so shall he do. You shall have one statute, both for the sojourner and for the native."