Jesus

30 But when he saw the wind,[e] he was afraid, and beginning to sink he cried out, “Lord, save me.” 31 Jesus immediately reached out his hand and took hold of him, saying to him, “O you of little faith, why did you doubt?”

Matthew 14:30-31

Then the disciples came to Jesus privately and said, “Why could we not cast it out?” 20 He said to them, “Because of your little faith. For truly, I say to you, if you have faith like a grain of mustard seed, you will say to this mountain, ‘Move from here to there,’ and it will move, and nothing will be impossible for you.”[e]

Matthew 17:19-20