Galatians 4:3

For we know that the Law is spiritual, but I am fleshly, having been sold into bondage under sin.

For you bear it if anyone enslaves you, anyone devours you, anyone takes advantage of you, anyone exalts himself, anyone hits you in the face.

However at that time, when you did not know God, you were slaves to those which by nature are no gods.

But now, having known God, or rather having been known by God, how is it that you turn back again to the weak and worthless elemental things, to which you want to be enslaved all over again?

This is spoken with allegory, for these women are two covenants: one from Mount Sinai bearing children into slavery; she is Hagar.

See to it that no one takes you captive through philosophy and empty deception, according to the tradition of men, according to the elementary principles of the world, and not according to Christ.

For though by this time you ought to be teachers, you have need again for someone to teach you the elementary principles of the oracles of God, and you have come to need milk and not solid food.

The one who believes in the Son of God has this witness in himself. The one who does not believe God has made Him a liar, because he has not believed in the witness which God has borne witness about His Son.