John 8:19
They said, therefore, to Him, "Where is Thy Father?" Jesus answered, "Ye know neither Me, nor My Father. If ye knew Me, ye would know My Father also."
John 8:54-55
Jesus answered, "If I glorify Myself, My glory is nothing. It is My Father Who glorifieth Me, of Whom ye say, that He is your God.
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.
John 17:6
I manifested 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 works they deny Him; being abominable, and disobedient, and for every good work worthless.
1 John 2:3-4
And in this we know that we have known Him, if we keep His commandments.