Isaiah 9:7 foretells the endless increase of the Messiah's reign — the very increase John declares must happen.

Daniel 2:35 shows the stone becoming a great mountain filling the earth — a direct picture of the kingdom's increase Jesus embodies.

Daniel 2:44 promises an indestructible kingdom — the permanent increase that Jesus' reign will never cease.

In 1 Corinthians 3:5, Paul sees himself as a mere servant — echoing John the Baptist's 'I must decrease' humility.

Colossians 1:18 declares Christ's preeminence over all — the very goal of John's 'He must increase'.

Matthew 11:11 comments directly on John's greatness and the greater one in the kingdom — linked to his 'decrease' statement.