It is narrated from Hazrat Abu Umamah (may Allah be pleased with him) that once he presented himself before the Noble Prophet (peace and blessings be upon him) and said, "Command me to do an action that will admit me to Paradise." The Noble Prophet (peace and blessings be upon him) said, "Make fasting obligatory upon yourself, for there is no action like fasting."
Hadith Referenceمسند احمد / مسند الأنصار رضي الله عنهم / 22276
Hadith Gradingحکم دارالسلام:حديث صحيح، رجاله ثقات غير أن بين أبى نصر وبين أبى أمامة رجاء بن حيوة الكندي