A.T. Robertson Commentary Mark 11:24

"Therefore I say unto you, All things whatsoever ye pray and ask for, believe that ye receive them, and ye shall have them." — Mark 11:24 (ASV)

Believe that ye have received them (πιστευετε οτ ελαβετε). That is the test of faith, the kind that sees the fulfilment before it happens. Ελαβετε is second aorist active indicative, antecedent in time to πιστευετε, unless it be considered the timeless aorist when it is simultaneous with it. For this aorist of immediate consequence see Joh 15:6.