bu Hurairah

 Narrated that the Prophet salla alayhi wa sallam said: ´´When the Adhan is pronounced, Satan takes to his heels and passes wind to aviod hearing the Adhan. When the Adhan is over, he comes back, and again takes to his heels when the Iqamah is pronounced and after its completion, he returns to whisper into the heart of a person (to distract his attention from his prayer) and makes him remember things which he does not recall before until man forgets how many Ra´kah he prayed.´´