Mark 9:24 shows a father crying out for help with his unbelief — echoing the apostles' request for increased faith here.

1 Corinthians 13:2 speaks of mountain-moving faith — the very kind Jesus references in Luke 17:6 after the apostles' request.

In 2 Thessalonians 1:3, Paul thanks God that their faith is growing — directly echoing the apostles' request for increased faith.

Hebrews 12:2 identifies Jesus as the perfecter of faith — the one who can answer the apostles' plea for increase.

In Matthew 15:28, Jesus commends great faith in a Canaanite woman — showing the kind of faith the apostles seek to have increased.

1 Corinthians 12:9 lists faith as a gift of the Spirit — showing that faith increase comes from God, not self-effort.