The Bible's instructions on how to "worthily" take Communion is written in 1 Corinthians 23-34.
Many people use verses 27-30 to teach people that if they take communion without asking for forgiveness they will be "judged" by God and punished with sickness. But let's look at these verses carefully to see if this is really what the scriptures are saying:
27 Therefore whoever eats this bread or drinks this cup of the Lord in an unworthy manner will be guilty of the body and blood of the Lord. 28 But let a man examine himself, and so let him eat of the bread and drink of the cup. 29 For he who eats and drinks in an unworthy manner eats and drinks judgment to himself, not discerning the Lord’s body. 30 For this reason many are weak and sick among you, and many sleep.If we look at verse 29, we see that the Bible is saying that the way we eat and drink judgement to ourselves when taking Communion is by not discerning the Lord's body (it has nothing to do with asking for forgiveness).
Discern literally means to recognize or comprehend mentally. So the Bible is telling us when we recognize or comprehend the significance of the Lord's body, this is how we take Communion in a worthy manner.
So what is it about the Lord's body that we should discern? That should be self-explanatory: By the stripes on Jesus Christ's body WE ARE HEALED. This is what we have to discern and remember when taking Communion. Doing so reminds us to trust in the fact that Jesus Himself bore all of our pains, sicknesses and diseases. When we are sick, we are literally baring an infirmity that Jesus BORE ALREADY... hence making His bodily wounds to be seemingly meaningless in our lives. This is what we need to remember when taking Communion. This is how we take Communion worthily.
After verse 29 that tells us to eat Communion worthily by discerning the Lords body, verse 30 says, For this reason many are weak and sick among you and many sleep. Many are sick when taking Communion, not because they are full of sinfulness, but because they do not DISCERN the Lord's body.
So long story short, when taking Communion you should remember to separate the significance of the blood (which is forgiveness). But don't focus on the Blood's purpose so much that you forget to discern the body and it's significance. Remember that By His Stripes We Are Healed.