John 8:19
"Where is your Father?" they asked him. "You have neither known me nor my Father," answered Jesus. "If you had known me, you would have known my father also."
John 8:54-55
"If I glorify myself." said Jesus, "my glory is nothing. It is my Father that glorifies me, and you say, 'He is our God.'
John 16:3
"And they will do these things because they have not known my Father, nor me.
John 17:3
And this is eternal life, to know thee, the only true God, and Jesus Christ whom thou hast sent.
John 17:6
"I have made known thy name to the men whom thou gavest me out of the world. Thine they were, and thou gavest them to me, and they have kept thy word.
Titus 1:16
They profess to know God, but by their deeds they disown him; in that they are detestable, disobedient, and reprobate for good work of any sort.
1 John 2:3-4
This is how we may know that we have come to know Him, by always keeping his commandments.