Sahih Muslim 782cBook 13, Hadith 229
حَدَّثَنَا إِسْحَاقُ بْنُ إِبْرَاهِيمَ، أَخْبَرَنَا مُعَاذُ بْنُ هِشَامٍ، حَدَّثَنِي أَبِي، عَنْ يَحْيَى بْنِ، أَبِي كَثِيرٍ حَدَّثَنَا أَبُو سَلَمَةَ، عَنْ عَائِشَةَ، - رضى الله عنها - قَالَتْ لَمْ يَكُنْ رَسُولُ اللَّهِ صلى الله عليه وسلم فِي الشَّهْرِ مِنَ السَّنَةِ أَكْثَرَ صِيَامًا مِنْهُ فِي شَعْبَانَ وَكَانَ يَقُولُ " خُذُوا مِنَ الأَعْمَالِ مَا تُطِيقُونَ فَإِنَّ اللَّهَ لَنْ يَمَلَّ حَتَّى تَمَلُّوا " . وَكَانَ يَقُولُ " أَحَبُّ الْعَمَلِ إِلَى اللَّهِ مَا دَاوَمَ عَلَيْهِ صَاحِبُهُ وَإِنْ قَلَّ " .
The Messenger of Allah (ﷺ) did not observe fast in any month of the year more than in the month of Sha'ban, and used to say: Do as many deeds as you are capable of doing, for Allah will not become weary (of giving you reward), but you would be tired (of doing good deeds) ; and he also said: The deed liked most by Allah is one to which the doer adheres constantly even if it is small.