5 occurrences across the corpus

King James Version

2 Thessalonians 2:13

But we are bound to give thanks alway to God for you, brethren beloved of the Lord, because God hath from the beginning chosen you to salvation through sanctification of the Spirit and belief of the truth:

Apostolic Fathers

Ignatius to the Trallians 2:2

For they that are heretics, confound together the doctrine of Jesus Christ, with their own poison: whilst they seem worthy of belief:

Ignatius to the Philadelphians 1:6

For there are many wolves who seem worthy of belief with a false pleasure lead captive those that run in the course of God; but in the concord they shall find no place.

Ignatius to the Smyrnaeans 2:11

Yea, God forbid that I should make any mention of them, till they shall repent to a true belief of Christ's passion, which is our resurrection.

NT Apocrypha/Pseudepigrapha

Acts of Paul and Thecla 10:8

Thecla now (on her return) found Thamyris dead, but her mother living. So calling her mother, she said to her: Theoclia, my mother, is it possible for you to be brought to a belief, that there is but one Lord God, who dwells in the heavens? If you desire great riches, God will give them to you by me; if you want your daughter again, here I am.