And the LORD said to Moses and Aaron, "This is the ordinance of the Passover: No foreigner shall eat it.
Exodus 12:43
Surrounding context
12:42 It is a night of solemn observance to the LORD for bringing them out of the land of Egypt. This is that night of the LORD, a solemn observance for all the children of Israel throughout their generations.
12:43 And the LORD said to Moses and Aaron, "This is the ordinance of the Passover: No foreigner shall eat it.
12:44 But every man's servant who is bought for money, when you have circumcised him, then he may eat it.