confirmation
4 occurrences across the corpus
King James Version
Philippians 1:7
Even as it is meet for me to think this of you all, because I have you in my heart; inasmuch as both in my bonds, and in the defence and confirmation of the gospel, ye all are partakers of my grace.
Hebrews 6:16
For men verily swear by the greater: and an oath for confirmation is to them an end of all strife.
NT Apocrypha/Pseudepigrapha
Acts of Paul and Thecla 11:14
And even that was by the permission of God, for the confirmation of their faith who should come to see this venerable place, and to convey blessings to those in succeeding ages, who should believe on our Lord Jesus Christ from a pure heart.
OT Pseudepigrapha
The Letter of Aristeas 9:59
The king gave his confirmation to the answer, and asked the next man, To whom ought men to entrust themselves?