Muwatta Imam Malik Book of Shortening the Prayer, Hadith 34

Yahya related to me from Malik from Ishaq ibn Abdullah ibn Abi Talha from Anas ibn Malik that his grandmother, Mulayka, invited the Messenger of Allah ﷺ for food and he ate some of it. Then the Messenger of Allah ﷺ said, "Get up and I will lead you in prayer."
Anas said, "I stood up and took a woven mat belonging to us that had become black through long use and sprinkled it with water, and the Messengerof Allah ﷺ stood on it. The orphan and I formed a row behind him, and the old woman stood behind us. He prayed two rakas with us and then left."

حَدَّثَنِي يَحْيَى، عَنْ مَالِكٍ، عَنْ إِسْحَاقَ بْنِ عَبْدِ اللَّهِ بْنِ أَبِي طَلْحَةَ، عَنْ أَنَسِ بْنِ مَالِكٍ، أَنَّ جَدَّتَهُ، مُلَيْكَةَ دَعَتْ رَسُولَ اللَّهِ ﷺ لِطَعَامٍ فَأَكَلَ مِنْهُ ثُمَّ قَالَ رَسُولُ اللَّهِ ﷺ " قُومُوا فَلأُصَلِّيَ لَكُمْ " . قَالَ أَنَسٌ فَقُمْتُ إِلَى حَصِيرٍ لَنَا قَدِ اسْوَدَّ مِنْ طُولِ مَا لُبِسَ فَنَضَحْتُهُ بِمَاءٍ فَقَامَ عَلَيْهِ رَسُولُ اللَّهِ ﷺ وَصَفَفْتُ أَنَا وَالْيَتِيمُ وَرَاءَهُ وَالْعَجُوزُ مِنْ وَرَائِنَا فَصَلَّى لَنَا رَكْعَتَيْنِ ثُمَّ انْصَرَفَ .