Lack of tranquility (at-tama’neenah) within the salaat. This is generally done out of ignorance and it is an open sin because tranquility is a pillar (rukn) of the salaah without which the salaah is incorrect. The hadeeth about the man who performed his salaah badly is a clear evidence for this. The meaning of tama’neenah (tranquility) is that the one praying is tranquil in the rukoo’ (bending), standing (‘itidaal), prostration (sujood), and sitting between the two prostrations (juloos), and he should get in position where every bone settles into place, he should not hasten between portions of the prayer until he hasattained tranquility in it and gives each its due time. The Prophet (sallallahu ‘alaihi wa sallam) said to the one who was rushing through his salaah without observing the proper tranquility: Go back and make salaah because you have not made the salaah. And in the hadeeth of Rifaa’ah on the story of the one who prayed badly it goes on: Then he makes takbeer and bows and puts his hands on his knees until each joint is settled and relaxed. Then he says ‘sami’allahu liman hamida’ (Allah hears the one who praises Him) then stands up straight until each bone is in its place.
