Romans 1:21
for, though they knew God, they have not honored him as God or given thanks to him, but they have indulged in futile speculations, until their stupid minds have become dark.
Romans 1:28-30
And just as they refused to recognize God any longer, God has abandoned them to unworthy impulses and indecent conduct.
2 Corinthians 6:15
How can Christ agree with Belial? Or what has a believer in common with an unbeliever?
John 8:55
yet you have never come to know him. But I know him. If I say I do not know him, I will be a liar like yourselves. No! I do know him, and I am faithful to his message.
John 16:3
They will do this because they do not know the Father or me.
John 17:3
And eternal life means knowing you as the only true God, and knowing Jesus your messenger as Christ.