Yahya related to me from Malik that al-Ala ibn Abd ar-Rahmansaid, "We visited Anas ibn Malik after dhuhr and he stood up andprayed asr. When he had finished his prayer, we mentioned doingprayers early in their time, or he mentioned it, and he said that hehad heard the Messenger of Allah, may Allah bless him and grant himpeace, say, the prayer of the hypocrites, the prayer of thehypocrites, the prayer of the hypocrites is that one of them sitsuntil the sun becomes yellow and is between the horns of Shaytan, oron the horn of Shaytan, and then gets up and rattles off four rakas,hardly remembering Allah in them at all.' "
USC-MSA web (English) reference: Book 15, Hadith 46
Arabic reference: Book 15, Hadith 518