Ephesians 2:12

that ye were at that time without Christ, alienated from the commonwealth of Israel, and strangers to the covenants of promise, having no hope, and atheists in the world:

1 John 5:18

We know that every one who is born of God sinneth not; but he that is born of God preserveth himself, and the wicked one toucheth him not.

Treasury of Scripture Knowledge

Summary

Neither from a stranger's hand shall ye offer the bread of your God of any of these; because their corruption is in them, and blemishes be in them: they shall not be accepted for you.

Bible References

Because

Ephesians 2:12
that ye were at that time without Christ, alienated from the commonwealth of Israel, and strangers to the covenants of promise, having no hope, and atheists in the world:
1 John 5:18
We know that every one who is born of God sinneth not; but he that is born of God preserveth himself, and the wicked one toucheth him not.