Matthew 21:21
Jesus answered and said unto them, Verily I say unto you, If ye have faith, and doubt not, ye shall not only do this which is done to the fig tree, but also if ye shall say unto this mountain, Be thou removed, and be thou cast into the sea; it shall be done.
Cross-reference
Matthew 17:20 has the same 'faith as a mustard seed' saying about moving mountains—a parallel teaching on faith's power.
In Matthew 14:29, Peter walks on water by faith — a concrete demonstration of the same mountain-moving faith Jesus describes here.
Mark 11:22 summarizes the lesson as 'Have faith in God'—the essential command behind the mountain-moving promise.
Mark 11:23 records the identical promise about saying to this mountain 'Be cast into the sea'—a direct parallel account.
Romans 4:20 says Abraham 'staggered not at the promise'—directly mirroring the 'doubt not' condition in the mountain-moving promise.
1 Corinthians 13:2 directly echoes this mountain-moving faith but emphasizes it is worthless without love.
Zechariah 4:7 asks 'What are you, O great mountain?' before Zerubbabel — a direct OT parallel to faith moving mountains.
Mark 9:23 declares 'everything is possible for one who believes,' directly echoing Jesus' teaching that faith can move mountains.
John 14:12 promises believers will do even greater works — the same promise of extraordinary deeds through faith in Jesus.
Acts 3:16 shows faith in Jesus' name healing a lame man — a specific example of faith producing the miraculous.
James 5:15 links prayer offered in faith to healing — a direct parallel to the promise that believing prayer brings results.
Job 9:5 declares God alone removes mountains — contrasting with Jesus' teaching that faith can also do it.
Luke 17:6 uses a sycamine tree instead of a mountain: faith as a mustard seed can uproot trees. Same principle, different object.
James 1:6 reinforces the condition of no doubting for answered prayer, paralleling the faith without doubt here.
Psalm 46:2 uses the same mountain-into-sea imagery to describe God's power, which faith here can command.