Albert Barnes Commentary Mark 11:22

"And Jesus answering saith unto them, Have faith in God." — Mark 11:22 (ASV)

Have faith in God. Literally, "Have the faith of God." This may mean to have strong faith, or to have confidence in God; a strong belief that He is able to accomplish things that appear most difficult with infinite ease, just as the fig tree was made to wither away by a word.