Galatians 4:1

I mean that the heir, as long as he is a child, is no different from a slave, although he is the owner of all the estate;

Galatians 4:23

But the son by the slave was born according to the flesh, and the son by the free woman through the promise.

Galatians 4:29

But as at that time he who was born according to the flesh persecuted him who was born according to the Spirit, so it is now.

Treasury of Scripture Knowledge

Summary

Now I say, That the heir, as long as he is a child, differeth nothing from a servant, though he be lord of all;

Bible References

That

Galatians 4:23
But the son by the slave was born according to the flesh, and the son by the free woman through the promise.