1 Corinthians 1:9
God is faithful [i.e., He will continue working among you] and it is through Him that you were called into the fellowship of His Son Jesus Christ our Lord.
1 Thessalonians 5:24
God, who calls you [into His fellowship] is faithful; He will also do [what He promises].
Titus 1:2
[and provides] hope for never ending life. God, who cannot lie, promised this [life] before the beginning of time,
Hebrews 6:18
He did this so that by two unchangeable things [i.e., His promise and His oath], (and it is impossible for God to lie), we, who have fled [to God] for refuge, could be greatly encouraged to take hold of the hope set before us [i.e., the hope of never ending life].