'Purchase' in the Bible

so that He might redeem and liberate those who were under the Law, that we [who believe] might be adopted as sons [as God’s children with all rights as fully grown members of a family].

who [willingly] gave Himself [to be crucified] on our behalf to redeem us and purchase our freedom from all wickedness, and to purify for Himself a chosen and very special people to be His own possession, who are enthusiastic for doing what is good.

I counsel you to buy from Me gold that has been heated red hot and refined by fire so that you may become truly rich; and white clothes [representing righteousness] to clothe yourself so that the shame of your nakedness will not be seen; and healing salve to put on your eyes so that you may see.