But in the place which the LORD thy God shall choose to make his name dwell in, there thou shalt offer Passover at evening about the going down of the sun, even in the season that thou camest out of Egypt.

And see that there be no leavened bread seen in all thy coasts seven days long, and that there remain nothing of the flesh which thou hast offered the first day at evening, until the morning.

until he have washed himself with water before the evening: and then when the sun is down, let him come into the host again.