The communion is the act of obedience to the words of Jesus when he said,    1 Cor 11:26 For as often as you eat this bread and drink this cup, you proclaim the Lord’s death till He comes.  NKJV  The cornerstone

of salvation is forgiveness. This forgiveness operates on two levels, first, God toward mankind and man to man.

After Adam and Eve sinned by rebelling against God’s word, man could no longer come into God’s presence because of his sin without a blood sacrifice. The first blood sacrifice is slain.

Gen 3: 21 Also for Adam and his wife the Lord God made tunics of skin, and clothed them. NKJV

Under the OT the idea of coming before God continued to require an animal sacrifice.

Heb 7:27 {for the priest}  to offer up sacrifice, first for his own sins, and then for the people’s: KJV

Every sin had a corresponding sacrifice so that the sinner might be forgiven.

Num 19:17 ‘And for an unclean person they shall take some of the ashes of the heifer burnt for purification from sin, and running water shall be put on them in a vessel. NKJV

According to the NT our sacrifice is Jesus Christ the Son of God. We find our forgiveness in Him.

John 1:29 The next day John saw Jesus coming toward him, and said, “Behold! The Lamb of God who takes away the sin of the world! NKJV

Acts 26:15 Who are You, Lord?’ And He said, ‘I am Jesus, whom you are persecuting.  16 But rise and stand on your feet; for I have appeared to you for this purpose, to make you a minister and a witness both of the things which you have seen and of the things which I will yet reveal to you.  17 I will deliver you from the Jewish people, as well as from the Gentiles, to whom I now send you,  18 to open their eyes, in order to turn them from darkness to light, and from the power of Satan to God, that they may receive forgiveness of sins and an inheritance among those who are sanctified by faith in Me.‘  NKJV

What happens when the child of God sins ?.

Rom 8:1 There is therefore now no condemnation to those who are in Christ Jesus, who do not walk according to the flesh, but according to the Spirit. 2 For the law of the Spirit of life in Christ Jesus has made me free from the law of sin and death. 3 For what the law could not do in that it was weak through the flesh, God did by sending His own Son in the likeness of sinful flesh, on account of sin: He condemned sin in the flesh, 4 that the righteous requirement of the law might be fulfilled in us who do not walk according to the flesh but according to the Spirit. 5 For those who live according to the flesh set their minds on the things of the flesh, but those who live according to the Spirit, the things of the Spirit. 6 For to be carnally minded is death, but to be spiritually minded is life and peace. 7 Because the carnal mind is enmity against God; for it is not subject to the law of God, nor indeed can be. 8 So then, those who are in the flesh cannot please God.

9 But you are not in the flesh but in the Spirit, if indeed the Spirit of God dwells in you. Now if anyone does not have the Spirit of Christ, he is not His. 10 And if Christ is in you, the body is dead because of sin, but the Spirit is life because of righteousness. 11 But if the Spirit of Him who raised Jesus from the dead dwells in you, He who raised Christ from the dead will also give life to your mortal bodies through His Spirit who dwells in you. NKJV

1 John 1:5 This is the message which we have heard from Him and declare to you, that God is light and in Him is no darkness at all. 6 If we say that we have fellowship with Him, and walk in darkness, we lie and do not practice the truth. 7 But if we walk in the light as He is in the light, we have fellowship with one another, and the blood of Jesus Christ His Son cleanses us from all sin.

8 If we say that we have no sin, we deceive ourselves, and the truth is not in us. 9 If we confess our sins, He is faithful and just to forgive us our sins and to cleanse us from all unrighteousness. 10 If we say that we have not sinned, we make Him a liar, and His word is not in us. NKJV

No condemnation, but chastisement and correction and if that fails premature death.

1 Cor 11:31 For if we searchingly examined ourselves [detecting our shortcomings and recognizing our own condition], we should not be judged and penalty decreed [by the divine judgment].

32 But when we [fall short and] are judged by the Lord, we are disciplined and chastened, so that we may not [finally] be condemned [to eternal punishment along] with the world. AMP

Sin in the church brings a powerful apostolic rebuke.

1 Cor 5:1 It is actually reported that there is sexual immorality among you, and such sexual immorality as is not even named among the Gentiles — that a man has his father’s wife! 2 And you are puffed up, and have not rather mourned, that he who has done this deed might be taken away from among you. 3 For I indeed, as absent in body but present in spirit, have already judged (as though I were present) him who has so done this deed. 4 In the name of our Lord Jesus Christ, when you are gathered together, along with my spirit, with the power of our Lord Jesus Christ, 5 deliver such a one to Satan for the destruction of the flesh, that his spirit may be saved in the day of the Lord Jesus. NKJV

After the rebuke, correction, and chastisement comes forgiveness and restoration.

2 Cor 2:5 But if anyone has caused grief, he has not grieved me, but all of you to some extent — not to be too severe. 6 This punishment which was inflicted by the majority is sufficient for such a man, 7 so that, on the contrary, you ought rather to forgive and comfort him, lest perhaps such a one be swallowed up with too much sorrow. 8 Therefore I urge you to reaffirm your love to him. 9 For to this end I also wrote, that I might put you to the test, whether you are obedient in all things. 10 Now whom you forgive anything, I also forgive. For if indeed I have forgiven anything, I have forgiven that one for your sakes in the presence of Christ, 11 lest Satan should take advantage of us; for we are not ignorant of his devices. NKJV

Our obligation to forgive others, because of what God has done for us in Christ.

Eph 4:30 And do not bring sorrow to God’s Holy Spirit by the way you live. Remember, he has identified you as his own, guaranteeing that you will be saved on the day of redemption.

31 Get rid of all bitterness, rage, anger, harsh words, and slander, as well as all types of evil behavior. 32 Instead, be kind to each other, tenderhearted, forgiving one another, just as God through Christ has forgiven you. NLT

Jesus surprised the religious by forgiving the worst of the worst.

Luke 7:44″Do you see this woman? I entered your house; you gave Me no water for My feet, but she has washed My feet with her tears and wiped them with the hair of her head.  45 You gave Me no kiss, but this woman has not ceased to kiss My feet since the time I came in.  46 You did not anoint My head with oil, but this woman has anointed My feet with fragrant oil.  47 Therefore I say to you, her sins, which are many, are forgiven, for she loved much. But to whom little is forgiven, the same loves little.”

48 Then He said to her, “Your sins are forgiven.” 49 And those who sat at the table with Him began to say to themselves,”Who is this who even forgives sins?” 50 Then He said to the woman, “Your faith has saved you. Go in peace.” NKJV