That which was from the beginning, which we have heard, which we have seen with our eyes, which we looked upon and have touched with our hands, concerning the word of life — the life was made manifest, and we have seen it, and testify to it and proclaim to you the eternal life, which was with the Father and was made manifest to us— that which we have seen and heard we proclaim also to you, so that you too may have fellowship with us; and indeed jour fellowship is with the Father and with his Son Jesus Christ. (1 John 1:1-3)

The two “that whiches”.

“The whole message from God to man, which tells of life, or, perhaps, out of which life springs, which beginning to be spoken by the prophets, was at last fully proclaimed by one who was his Son.” — BF Westcott

The second “that which”.

… that which we have seen and heard we proclaim also to you, so that you too may have fellowship with us; and indeed our fellowship is with the Father and with his Son Jesus Christ. (1 John 1:3)

And we are writing these things so that our joy may be complete. This is the message we have heard from him and proclaim to you, that God is light, and in him is no darkness at all. (1 John 1:4-5)

Three lies and a truth.

If we say we have fellowship with him while we walk in darkness, we lie and do not practice the truth. But if we walk in the light, as he is in the light, we have fellowship with one another, and the blood of Jesus his Son cleanses us from all sin. If we say we have no sin, we deceive ourselves, and the truth is not in us. If we confess our sins, he is faithful and just to forgive us our sins and to cleanse us from all unrighteousness. If we say we have not sinned, we make him a liar, and his word is not in us. My little children, I am writing these things to you so that you may not sin. But if anyone does sin, we have an advocate with the Father, Jesus Christ the righteous. He is the propitiation for our sins, and not for ours only but also for the sins of the whole world. (1 John 1:6–2:2)

Lie #1: I have fellowship with God while I walk in darkness.
Result of lie #1: I am a liar.

Lie #2: I have no sin.
Result of lie #2: I lie to myself.

Lie #3: I have not sinned.
Result of lie #3: I make God a liar.

Jesus took on Himself the wrath of God that was directed at us, so that now God looks on who trust Jesus with favor.