John Gill Commentary Mark 4:40

"And he said unto them, Why are ye fearful? have ye not yet faith?" — Mark 4:40 (ASV)

And he said to them
His disciples,

why are you so fearful ?
since he was with them in person, whose power to keep and preserve them, they had no room to question, when they reflected on the miracles they had so lately seen performed by him:

how is it that you have no faith ?
That is, in exercise: faith they had, but it was very small, and scarcely to be called faith: they did indeed apply to him to save them, which showed some faith in him, but then they feared it was too late, and that they were past all hope, and were just perishing; (See Gill on Matthew 8:26).