Jn 5:37-39, Jn 14:8-9, 2 Cor 4:4, Col 1:15, Heb 1:3
In the Old Testament, the Israelites heard the voice of God but did not see the image of God. (Deuteronomy 4:12,15)
Deuteronomy 4:12 And the Lord spake unto you out of the midst of the fire: ye heard the voice of the words, but saw no similitude; only ye heard a voice. 15 Take ye therefore good heed unto yourselves; for ye saw no manner of similitude on the day that the Lord spake unto you in Horeb out of the midst of the fire:
Those who believe that Jesus is the Christ can hear the voice of God and see the image of God. (John 5:37-39)
John 5:37 And the Father himself, which hath sent me, hath borne witness of me. Ye have neither heard his voice at any time, nor seen his shape. 38 And ye have not his word abiding in you: for whom he hath sent, him ye believe not. 39 Search the scriptures; for in them ye think ye have eternal life: and they are they which testify of me.
Jesus Christ is the image of God. (John 14:8-9, 2 Corinthians 4:4, Colossians 1:15, Hebrews 1:3)
John 14:8 Philip saith unto him, Lord, show us the Father, and it sufficeth us. 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, Show us the Father?
2 Corinthians 4:4 In whom the god of this world hath blinded the minds of them which believe not, lest the light of the glorious gospel of Christ, who is the image of God, should shine unto them.
Colossians 1:15 Who is the image of the invisible God, the firstborn of every creature:
Hebrews 1:3 Who being the brightness of his glory, and the express image of his person, and upholding all things by the word of his power, when he had by himself purged our sins, sat down on the right hand of the Majesty on high: