Humaid b. ‘Abd ar-Rahman b. ‘Auf said that one of the companions of the Prophet (ﷺ) told how he decided when he was on a journey along with God’s Messenger that he must watch his prayer to see how he conducted it. When he had prayed the evening prayer, which is the 'atama, he lay down for a long period during the night, then awoke, looked at the horizon and said, “Our Lord, You have not created this in vain…verily You dost not break Your promise” (Al-Qur’an; 3:191,194). Then God's Messenger went to his couch from which he took out a toothstick, then poured out some water into a bowl from a skin vessel beside him, cleaned his teeth, and stood up and prayed, till it appeared to me that he prayed as long as he had slept. Then he lay down till it appeared to me that he slept as long as he had prayed. Then awakening and doing as he did the first time, he said the same as he had said. He did that three times before the dawn. Nasa’i transmitted it.
