I think that here is set forth some early tokens of the Lord's love to the Gentile church. How sweetly since that time have the mercies towards that church been extended. Galatians 4:27 with Isaiah 54:1.
Related Commentaries of Exodus 12:47
Exodus 12:47-49
47 All the congregation of Israel shall keepk it.
48 And when a stranger shall sojourn with thee, and will keep the passover to the LORD, let all his males be circumcised, and then let him come near and keep it; and he shall be as one that is born in the land: for no uncircumcised person shall eat thereof.
49 One law shall be to him that is homeborn, and unto the stranger that sojourneth among you.