مُوَطَّأُ مَالِكٍ
Muwatta Malik 421
Shortening the Prayer
وَحَدَّثَنِي عَنْ مَالِكٍ، عَنِ ابْنِ شِهَابٍ، عَنْ عَبَّادِ بْنِ تَمِيمٍ، عَنْ عَمِّهِ، أَنَّهُ رَأَى رَسُولَ اللَّهِ صلى الله عليه وسلم مُسْتَلْقِيًا فِي الْمَسْجِدِ وَاضِعًا إِحْدَى رِجْلَيْهِ عَلَى الأُخْرَى .
Yahya related to me from Malik from Ibn Shihab from Abbad ibn Tamim from his paternal uncle that he saw the Messenger of Allah, (ﷺ), lying down in the mosque with one foot on top of the other.
Arabic/English book reference: Book 9, Hadith 90