John 8:19
Then said they to 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 assume glory to myself, my glory is nothing: it is the Father who glorifies 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 eternal life, that they should know thee the only true God, and him whom thou hast sent, Jesus, the Messiah.
John 17:6
I have made known thy name to the persons whom thou gavest me out of the world: for thee they had a being, and to me thou hast given them; and thy word have they kept.
Titus 1:16
They profess to know God; but in works deny him, being abominable and disobedient, and unto every good work reprobate.
1 John 2:3-4
And hereby we know that we know him, if we keep his commandments.