Matthew 21:21 So Jesus answered and said to them, “Assuredly, I say to you, if you have faith and do not doubt, you will not only do what was done to the fig tree, but also if you say to this mountain, ‘Be removed and be cast into the sea,’ it will be done. 22 “And whatever things you ask in prayer, believing, you will receive.” 23 Now when He came into the temple, the chief priests and the elders of the people confronted Him as He was teaching, and said, “By what authority are You doing these things? And who gave You this authority?”
Again the Lord Jesus emphasis is on speaking (say to this mountain, ask in prayer) and faith (believing). Notice the action verbs “say”, “ask”, and “believing”. There is always action in prayer, but not some outward doing, but just faith and speaking.