Acts 20:28
So, pay close attention to your [own] lives, and to all [members] of the flock [i.e., the congregation] of which the Holy Spirit has made you overseers [i.e., elders, shepherds or pastors]. Provide [spiritual] food for the church of the Lord which He purchased by [shedding] His own blood.
Titus 2:14
He gave Himself up for us, to buy us back from [enslavement to] all [kinds of] wickedness and to purify for Himself a group of people who belong to Him and who are eager to do good deeds.
Revelation 5:9
And they sang a new song [which went like this]: "You deserve to take the book and break the seals on it, for you were killed and, with your blood, you purchased people for God from every tribe and language and race and nation,