Sahih Muslim Book: 7, Hadith: 1862

وَحَدَّثَنِي مُحَمَّدُ بْنُ حَاتِمٍ، حَدَّثَنَا بَهْزٌ، حَدَّثَنَا وُهَيْبٌ، حَدَّثَنَا مُوسَى بْنُ عُقْبَةَ، قَالَ سَمِعْتُ أَبَا النَّضْرِ، عَنْ بُسْرِ بْنِ سَعِيدٍ، عَنْ زَيْدِ بْنِ ثَابِتٍ، أَنَّ النَّبِيَّ صلى الله عليه وسلم اتَّخَذَ حُجْرَةً فِي الْمَسْجِدِ مِنْ حَصِيرٍ فَصَلَّى رَسُولُ اللَّهِ صلى الله عليه وسلم فِيهَا لَيَالِيَ حَتَّى اجْتَمَعَ إِلَيْهِ نَاسٌ ‏.‏ فَذَكَرَ نَحْوَهُ وَزَادَ فِيهِ ‏ “‏ وَلَوْ كُتِبَ عَلَيْكُمْ مَا قُمْتُمْ بِهِ ‏”‏ ‏.‏ ‘A’isha reported that the Messenger of Allah (may peace be upon him) had a mat and he used it for making an apartment during the night and observed prayer in it, and the people began to pray with him, and he spread it (the mat) during the day time. The people crowded round him one night. He (the Holy Prophet) then Eaid:O people, perform such acts as you are capable of doing, for Allah does not grow weary but you will get tired. The acts most pleasing to Allah are those which are done continuously, even if they are small. And it was