Verses with the word gainsaying in the New Testament (3 verses):

Acts 10:29
Therefore came I unto you without gainsaying, as soon as I was sent for: I ask therefore for what intent ye have sent for me?

Romans 10:21
But to Israel he saith, All day long I have stretched forth my hands unto a disobedient and gainsaying people.

Jude 1:11
Woe unto them! for they have gone in the way of Cain, and ran greedily after the error of Balaam for reward, and perished in the gainsaying of Core.