مُوَطَّأُ مَالِكٍ
Muwatta Malik 164
Prayer
وَحَدَّثَنِي عَنْ مَالِكٍ، عَنِ ابْنِ شِهَابٍ، عَنْ عَلِيِّ بْنِ حُسَيْنِ بْنِ عَلِيِّ بْنِ أَبِي طَالِبٍ، أَنَّهُ قَالَ كَانَ رَسُولُ اللَّهِ صلى الله عليه وسلم يُكَبِّرُ فِي الصَّلاَةِ كُلَّمَا خَفَضَ وَرَفَعَ فَلَمْ تَزَلْ تِلْكَ صَلاَتَهُ حَتَّى لَقِيَ اللَّهَ .
Yahya related to me from Malik from Ibn Shihab that AIi ibn Husayn ibn Ali ibn Abi Talib said, "The Messenger of Allah, (ﷺ), used to say, 'Allah is greater' whenever he lowered himself and raised himself, and he continued to pray like that until he met Al lah ."
Arabic/English book reference: Book 3, Hadith 18