Many, buit this one is clear for all to see:
1Jn 4:2 Hereby know ye the Spirit of God: Every spirit that confesseth that Jesus Christ is come in the flesh is of God:
I had to put that verse to explain the following:
Mat 16:15 He saith unto them, But whom say ye that I am?
Mat 16:16 And Simon Peter answered and said, Thou art the Christ, the Son of the living God.
Mat 16:17 And Jesus answered and said unto him, Blessed art thou, Simon Barjona: for flesh and blood hath not revealed it unto thee, but my Father which is in heaven.
Now we see that Peter was of God (even though He did the following):
Mat 16:22 Then Peter took him, and began to rebuke him, saying, Be it far from thee, Lord: this shall not be unto thee.
Mat 16:23 But he turned, and said unto Peter, Get thee behind me, Satan: thou art an offence unto me: for thou savourest not the things that be of God, but those that be of men.
Would Peter rebuke God? But I have more to show He did not know, but simply believed (which is a step to knowledge of God).
Joh 7:38 He that believeth on me, as the scripture hath said, out of his belly shall flow rivers of living water.
Joh 7:39 (But this spake he of the Spirit, which they that believe on him should receive: for the Holy Ghost was not yet given; because that Jesus was not yet glorified.)
Joh 20:22 And when he had said this, he breathed on them, and saith unto them, Receive ye the Holy Ghost:
Joh 20:23 Whose soever sins ye remit, they are remitted unto them; and whose soever sins ye retain, they are retained.
This happened after Peter was of God (even though He did not Know Jesus was God, He just believed)
Joh 14:1 Let not your heart be troubled: ye believe in God, believe also in me.
Joh 14:2 In my Father's house are many mansions: if it were not so, I would have told you. I go to prepare a place for you.
Joh 14:3 And if I go and prepare a place for you, I will come again, and receive you unto myself; that where I am, there ye may be also.
Joh 14:4 And whither I go ye know, and the way ye know.
Joh 14:5 Thomas saith unto him, Lord, we know not whither thou goest; and how can we know the way?
Joh 14:6 Jesus saith unto him, I am the way, the truth, and the life: no man cometh unto the Father, but by me.
Joh 14:7 If ye had known me, ye should have known my Father also: and from henceforth ye know him, and have seen him.
Joh 14:8 Philip saith unto him, Lord, shew us the Father, and it sufficeth us.
Joh 14:9 Jesus saith unto him, Have I been so long time with you, and yet hast thou not known me, Philip? he that hath seen me hath seen the Father; and how sayest thou then, Shew us the Father?
Joh 14:10 Believest thou not that I am in the Father, and the Father in me? the words that I speak unto you I speak not of myself: but the Father that dwelleth in me, he doeth the works.
Joh 14:11 Believe me that I am in the Father, and the Father in me: or else believe me for the very works' sake.
Joh 14:12 Verily, verily, I say unto you, He that believeth on me, the works that I do shall he do also; and greater works than these shall he do; because I go unto my Father.
Here we see some clear examples of some who followed Jesus (they are His from the beginning), but did not know that Jesus is God.
If I need more examples, please tell me. (Also remember that Peter denied God/Jesus, and He didn't after the Holy Spirit was given).