John 8:19
Then said they unto Him, Where is thy Father? Jesus answered, Ye neither know me, nor my Father: if ye had known me, ye would have known my Father also.
John 8:54-55
Jesus answered, If I honour myself, my honor is nothing: it is my Father that glorifieth me, of whom ye say that He is your God.
John 16:3
And these things will they do unto you; because they have not known the Father, nor me.
John 17:3
and this is life eternal, to know Thee the only true God, and Jesus Christ whom thou hast sent.
John 17:6
I have 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 in works deny Him, being abominable and disobedient, and to every thing that is good void of understanding.
1 John 2:3-4
And by this we know that we have known Him, if we keep his commandments.