Musnad Ahmad 32:986

I read to Abd al-Rahman, [from] Malik, from al-Ala’ ibn Abd al-Rahman, that he said: We entered upon Anas ibn Malik after the noon [prayer], and he stood to pray the afternoon [prayer]. When he finished his prayer, we mentioned the hastening of the prayer—or he mentioned it—and he said: I heard the Messenger of Allah, peace and blessings of Allah be upon him, say: "That is the prayer of the hypocrites, that is the prayer of the hypocrites. One of them sits until, when the sun turns yellow and is between the two horns of the devil—or upon the horn of the devil—he stands and pecks four [rak'ahs], not remembering Allah in them except a little."