At that time the son born by human effort persecuted the son born by the power of the Spirit. It is the same now.
NIV
Yet [just] as at that time the child [of ordinary birth] born according to the flesh despised and persecuted him [who was born remarkably] according to [the promise and the working of] the [Holy] Spirit, so it is now also. [Gen. 21:9.]AMP
But as then he that was born after the flesh persecuted him that was born after the Spirit, even so it is now.
KJV
But what does Scripture say? "Get rid of the slave woman and her son, for the slave woman's son will never share in the inheritance with the free woman's son."
NIV
But what does the Scripture say? Cast out and send away the slave woman and her son, for never shall the son of the slave woman be heir and share the inheritance with the son of the free woman. [Gen. 21:10.]AMP
Nevertheless what saith the scripture? Cast out the bondwoman and her son: for the son of the bondwoman shall not be heir with the son of the freewoman.
KJV
To redeem those under the law, that we might receive adoption to sonship.
NIV
To purchase the freedom of (to ransom, to redeem, to atone for) those who were subject to the Law, that we might be adopted and have sonship conferred upon us [and be recognized as God's sons].
AMP
To redeem them that were under the law, that we might receive the adoption of sons.
KJV
Formerly, when you did not know God, you were slaves to those who by nature are not gods.
NIV
But at that previous time, when you had not come to be acquainted with and understand and know the true God, you [Gentiles] were in bondage to gods who by their very nature could not be gods at all [gods that really did not exist].
AMP
Howbeit then, when ye knew not God, ye did service unto them which by nature are no gods.
KJV
But now that you know God – or rather are known by God – how is it that you are turning back to those weak and miserable forces? Do you wish to be enslaved by them all over again?
NIV
Now, however, that you have come to be acquainted with and understand and know [the true] God, or rather to be understood and known by God, how can you turn back again to the weak and beggarly and worthless elementary things [of all religions before Christ came], whose slaves you once more want to become?
AMP
But now, after that ye have known God, or rather are known of God, how turn ye again to the weak and beggarly elements, whereunto ye desire again to be in bondage?
KJV