'Children' in the Bible

So also we, when we were children, we were enslaved under the elemental spirits of the world.

My children, for whom I am having birth pains again, until Christ is formed in you!

which [things] are spoken allegorically, for these [women] are two covenants, one from Mount Sinai, bearing [children] for slavery, who is Hagar.

Now Hagar is Mount Sinai in Arabia, and corresponds to the present Jerusalem, for she is a slave with her children.

For it is written, "Rejoice, O barren woman, who does not give birth to [children]; burst out and shout, [you] who do not have birth pains, because many [are] the children of the desolate [woman], even more than [those of] the one who has a husband."

But you, brothers, are children of the promise, just as Isaac.

Therefore, brothers, we are not children of the female slave but of the free woman.