How do we know that the Lord's Supper is for believers only?

In 1 Corinthians 11, we see that the Apostle Paul makes clear that the ordinance of communion is not intended for everyone, but specifically for those sanctified in Christ Jesus. This means that only those who have responded to God's call and been set apart as believers should partake in the Lord's Supper. The seriousness of participating unworthily is emphasized in verse 27, where it warns of the danger of eating and drinking judgment upon oneself by failing to discern the significance of Christ's body and blood. Therefore, communion serves as a reminder of the covenant relationship between Christ and His elect, reinforcing the importance of our faith being centered on Him.