1 Corinthians 11:20
When ye come together therefore into one place, this is not to eat the Lord’s supper.
Cross-reference
In 1 Corinthians 11:17, Paul introduces that their gatherings are harmful, setting up why the Lord's Supper is not truly observed.
Acts 2:42 describes devoted breaking of bread in unity — contrasts with the divisions that made their gathering not the Lord's Supper.
Acts 2:46 shows joyful, generous breaking of bread in homes — contrasts sharply with the selfish, divisive practice in Corinth.
Acts 20:7 records a gathering to break bread with teaching — a positive example of proper Lord's Supper observance, opposite to Corinth's corruption.
Zechariah 7:6 questions eating/drinking only for yourselves — echoes selfish motives behind the Corinthian abuse of the Lord's Supper.
2 Peter 2:13 describes false teachers indulging in love feasts, mirroring the abuse of the communal meal in Corinth.
Hosea 8:13 shows God rejecting offerings because of sin — parallels how Corinthian practices make the Lord's Supper unacceptable.