'Confirmed' in the Bible

In this way, the testimony about Christ was confirmed among you,

This is the third time I am coming to you. Every fact must be established by the testimony of two or three witnesses.

how will we escape if we neglect such a great salvation? It was first spoken by the Lord and was confirmed to us by those who heard Him.

So we have the prophetic word strongly confirmed. You will do well to pay attention to it, as to a lamp shining in a dismal place, until the day dawns and the morning star rises in your hearts.