New Testament scripture is making more sense. In the Old Testament, if you were not a part of the priest's family or a Levite, you were not allowed to eat the sacrificial offerings. If you did, on purpose, you took on the iniquity of that offering. However, if the priest bought you with his own money, you became his and considered a part of his household. At that point, if you ate the sacrifice you were sanctified. If you weren't bought by him or weren't a member of his family, the burden of that sin sacrifice was now laid upon you!
Jesus is our Priest. He bought us, and we are now a part of his household. Because of the price He paid for us, we are allowed to eat of the sacrificial offerings. He said his body was the bread. If an unbeliever partakes of Christ's body, just as we have but have not committed to him, it appears they will be overtaken by a heavy burden of the sin we've committed and been forgiven of. It makes so much sense why a warning comes with taking communion. However, because Jesus bought us, we are free to eat. It is unbelievers who should be warned, not us! I have never been so scared for someone who has taken communion without being saved. It's like they are now the sacrifice. Fear not for yourself; fear for those outside of Christ who didn't heed the warning.
But if the priest buy any soul with his money, he shall eat of it, and he that is born in his house: they shall eat of his meat. Leviticus 22:11
And they shall not profane the holy things of the children of Israel, which they offer unto the LORD; Or suffer them to bear the iniquity of trespass, when they eat their holy things: for I the LORD do sanctify them. Leviticus 22:15-16
And as they were eating, Jesus took bread, and blessed it, and brake it, and gave it to the disciples, and said, Take, eat; this is my body. Matthew 26:26
For ye are bought with a price: therefore glorify God in your body, and in your spirit, which are God's. 1 Corinthians 6:20