Romans 1:21
because, having known God, they did not glorify Him as God, nor did they give thanks; but they became vain in their reasonings, and their senseless heart was darkened.
Romans 1:28-30
And, as they did not approve the holding of God in their knowledge, God delivered them up to a reprobate mind, to do those things which are not becoming;
2 Corinthians 6:15
And what concord of Christ is there with Belial? or what portion has a believer with an unbeliever?
John 8:55
And ye have not known Him, but I know Him; and, if I should say, I know Him not, I shall be a liar like you. But I know Him, and I keep His word.
John 16:3
And these things will they do, because they have not known the Father, nor Me.
John 17:3
And this is the eternal life, that they know Thee, the only true God, and Jesus Christ Whom Thou didst send.