1 Corinthians 1:31
So, as it is written [Jer. 9:23f], "The person who [wants to] boast, let him boast about the Lord."
Galatians 3:8
And, predicting that God would consider the Gentiles right with Him by [their] faith, the Scriptures previously recorded [this promise of] the Gospel to Abraham by saying [Gen. 12:3], "All nations will receive a blessing through your descendant [i.e., Jesus]."
2 Corinthians 10:17
[Jer. 9:24 says], "But the person who boasts should boast about the Lord."
Philippians 3:3
For we [Christians] are the [true] circumcision [i.e., the real "Jews" in God's eyes. See Rom. 2:28-29]. We worship by means of God's Holy Spirit [i.e., are empowered and motivated by the Holy Spirit], and boast in [the person and work of] Christ Jesus, and [we] place no confidence in the flesh [i.e., in any outward ritual or status for salvation].