PASSOVER ACCORDING TO SCRIPTURE
Leviticus 23:4-8 
5 In the fourteenth day of the first month at even is the LORD’S Passover. 6 And on the fifteenth day of the same month is the feast of unleavened bread unto the Messiah: seven days ye must eat unleavened bread. 7 In the first day ye shall have a Set Apart convocation: ye shall do no servile work therein.
Numbers 9:14 – And if a stranger shall sojourn among you, and will keep the Passover unto the Messiah; according to the ordinance of the Passover, and according to the manner thereof, so shall he do: ye shall have one ordinance, both for the stranger, and for him that was born in the land.