Mishkat al-Masabih 4 Prayer كتاب الصلاة 657

وَعَنْ عَائِشَةَ قَالَتْ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «أَحَبُّ الْأَعْمَالِ إِلَى الله أدومها وَإِن قل»

‘A’isha reported God’s Messenger as saying, “The acts most pleasing to God are those which are done most continuously, even if they amount to little.” (Bukhari and Muslim.)