John 8:19
"Where is your Father?" they said. Jesus replied, "You know neither me nor my Father; if you had known me you would have known my Father also."
John 8:54-55
Jesus replied, "Were I to glorify myself, my glory would be nothing; it is my Father who glorifies me; you say 'He is our God,'
John 16:3
This they will do to you, because they have not known the Father nor me.
John 17:3
And this is eternal life, that they know thee, the only real God, and him whom thou hast sent, even Jesus Christ.
John 17:6
I have made thy Name known to the men whom thou hast given to me from the world (thine they were, and thou gavest them to me), and they have held to thy word.
Titus 1:16
They profess to know God, but they deny him by their deeds; they are detestable, disobedient, and useless for good work of any kind.
1 John 2:3-4
This is how we may be sure we know him, by obeying his commands.