Romans 1:21
Though they knew God, they have not glorified him as God nor given thanks to him; they have turned to futile speculations till their ignorant minds grew dark.
Romans 1:28-30
Yes, as they disdained to acknowledge God any longer, God has given them up to a reprobate instinct, for the perpetration of what is improper,
2 Corinthians 6:15
What harmony can there be between Christ and Beliar, or what business has a believer with an unbeliever?
John 8:55
but you do not understand him. I know him. Were I to say, 'I do not know him,' I would be a liar like yourselves; but I do know him and I hold to his word.
John 16:3
This they will do to you, because they have not known the Father nor me.
John 17:3
And this is eternal life, that they know thee, the only real God, and him whom thou hast sent, even Jesus Christ.