1 Corinthians 14:18
I thank my God, I speak with tongues more than ye all:
Cross-reference
1 Corinthians 4:7
Contrast
In 1 Corinthians 4:7, Paul warns against boasting in gifts received, tempering any pride from his claim to speak in tongues more.
Acts 2:4
Historical context
In Acts 2:4, the disciples speak in tongues at Pentecost, providing the biblical precedent for the gift Paul exercises in v18.