1 Corinthians 10:21 contrasts the cup of the Lord with the cup of demons — applying the same communion imagery to forbid idolatry.

1 Cor 10:20 contrasts participation with demons against participation in Christ's body/blood, warning against idolatry.

In 1 Corinthians 11:24, the institution of the Lord's Supper provides the basis for the participation in Christ's body and blood mentioned here.

1 Corinthians 11:23-29 recounts the Lord's Supper institution and warns against unworthy participation — expanding on the cup and bread.

1 Cor 11:21 depicts abuse of the Lord's Supper — contrasting with the true participation Paul describes here.

1 Cor 1:9 calls believers into fellowship (koinonia) with Christ, the same word used for participation here.

1 Cor 12:13 speaks of being made to drink of one Spirit, uniting believers in one body — akin to the communion here.

Acts 20:7 records a specific gathering on the first day of the week to break bread, the same practice Paul discusses here.

1 John 1:7 mentions fellowship (koinonia) and cleansing by Jesus' blood, directly echoing the blood of Christ here.

Acts 20:11 again shows Paul breaking bread with believers, reinforcing the communion practice described here.

Acts 2:42 shows the early church devoting themselves to the breaking of bread, the same practice of communion referenced here.

John 6:53-58 has Jesus teaching about eating His flesh and drinking His blood for life, prefiguring the Lord's Supper.

Luke 22:20 records Jesus instituting the cup as the new covenant in His blood, echoing the cup of blessing here.

Luke 22:19 records Jesus instituting the bread as His body, directly paralleling the bread of participation here.

Mark 14:22-25 similarly recounts Jesus instituting the Lord's Supper — another Gospel account of the event behind Paul's phrase.

Matthew 26:26-28 records Jesus' words over the bread and cup at the Last Supper — the same event Paul refers to as participation.

Mark 14:24 says 'This is my blood of the covenant' — the cup is participation in Christ's blood, the very point Paul makes.

Mark 14:23 describes Jesus taking the cup and giving thanks — the same institution Paul refers to.

Matthew 26:27 records Jesus giving thanks over the cup at the Last Supper — the same cup of blessing Paul mentions here.

Exodus 24:11 describes the covenant meal where Israel ate and drank in God's presence, a type of the communion cup and bread here.

Acts 2:46 describes daily breaking of bread in homes, possibly the Lord's Supper, echoing the communal participation here.

1 John 1:3 uses koinonia for fellowship with the Father and Son, the same Greek root as participation here.

Heb 3:14 speaks of sharing (metochos) in Christ if we hold firm, tying perseverance to participation in Christ.

Psalm 116:13 mentions the cup of salvation, which may prefigure the cup of blessing in communion here; a thematic parallel.