Mukhtasar Bukhari

Narrated from Sayyiduna Abu Hurairah (may Allah be pleased with him) that the Noble Prophet (peace and blessings of Allah be upon him) said: "When the call to prayer (adhan) is given, Satan turns his back and runs away (and out of fear) he passes wind as he runs (and keeps running) until he does not hear the sound of the adhan. Then when the adhan is completed, he comes back, and when the iqamah for prayer is pronounced, he turns his back and runs away again until the iqamah is completed. Then he comes back and puts whispers between a man and his heart. He says, 'Remember such and such, remember such and such,' things which he had not remembered before, until a person forgets how much he has prayed."