'Attest' in the Bible

But I do not consider my life as something of value or dear to me, so that I may [with joy] finish my course and the ministry which I received from the Lord Jesus, to testify faithfully of the good news of God’s [precious, undeserved] grace [which makes us free of the guilt of sin and grants us eternal life].

If however I should choose to boast, I should not be a fool for so doing, for I should be speaking the truth. But I forbear, lest any one should be led to estimate me more highly than what his own eyes attest, or more highly than what he hears from my lips.

Through Silvanus, the faithful brother (as I consider [him]), I have written to you {briefly} to encourage [you] and to attest that this is the true grace of God. Stand firm in it.

“I, Jesus, have sent My angel to attest these things to you for the churches. I am the Root and the Offspring of David, the Bright Morning Star.”