Mark 11:23

Overview - Mark 11
Christ rides with triumph into Jerusalem;
12 curses the fruitless fig-tree;
15 purges the temple;
20 exhorts his disciples to stedfastness of faith, and to forgive their enemies;
27 and defends the lawfulness of his actions by the witness of John, who was a man sent of God.
Treasury of Scripture Knowledge

Mark 11:23  (King James Version)
For verily I say unto you, That whosoever shall say unto this mountain, Be thou removed, and be thou cast into the sea; and shall not doubt in his heart, but shall believe that those things which he saith shall come to pass; he shall have whatsoever he saith.

Matthew 17:20 ; 21:21 Luke 17:6 ; 1 Corinthians 13:2

and shall
Matthew 14:13 ; Romans 4:18-25 ; Hebrews 11:17-19 ; James 1:5 James 1:6

Psalms 37:4 ; John 14:13 ; 15:7