A.T. Robertson Commentary Mark 11:22

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

Have faith in God (εχετε πιστιν θεου). Objective genitive θεου as in Gal 2:26; Romans 3:22,26. That was the lesson for the disciples from the curse on the fig tree so promptly fulfilled. See this point explained by Jesus in Mt 21:21 which see for "this mountain" also.