It is narrated from Hazrat Abu Huraira (may Allah be pleased with him) that the Holy Prophet (peace and blessings be upon him) said: When the call to prayer (adhan) is given, Satan runs away while passing wind loudly so that he does not hear the adhan. When the adhan is finished, he comes back and puts doubts in the heart of a person so that he forgets. Therefore, if any of you has doubt in his prayer, after saying salam, while sitting, he should perform two prostrations of forgetfulness (sajda sahw).