'Servants' in the Bible

And that because of the false brothers let in secretly, who came searching out our free condition which we have in Christ Jesus, so that they might make servants of us;

But at that time, having no knowledge of God, you were servants to those who by right are no gods:

But now that you have come to have knowledge of God, or more truly, God has knowledge of you, how is it that you go back again to the poor and feeble first things, desiring to be servants to them again?

Which things have a secret sense; because these women are the two agreements; one from the mountain of Sinai, giving birth to servants, which is Hagar.

For ye, brethren, were called for freedom; only use not your freedom for an occasion to the flesh, but through love be servants one to another.