Exodus 12:43-45

New Century Version

⁴³ The Lord told Moses and Aaron, “Here are the rules for Passover: No foreigner is to eat the Passover. ⁴⁴ If someone buys a slave and circumcises him, the slave may eat the Passover. ⁴⁵ But neither a person who lives for a short time in your country nor a hired worker may eat it.