Sahih Bukhari
To make the Heart Tender (Ar-Riqaq)
Volume: 008 / Book Number: 076 / Hadith Number: 471
Narrated 'Aisha:
Allah's Apostle said, "Do good deeds properly, sincerely and moderately and know that your deeds will not make you enter Paradise, and that the most beloved deed to Allah's is the most regular and constant even though it were little."