It is narrated from Sayyiduna Kahmas al-Hilali (may Allah be pleased with him), who, relating a long hadith, said: I came to the Prophet (peace and blessings be upon him) and informed him of my acceptance of Islam. Then I stayed away from him for a year, after which I came to him again and said: O Messenger of Allah, do you recognise me? He (peace and blessings be upon him) said: "Yes." I said: O Messenger of Allah, since I parted from you I have not once broken my fast (that is, I have fasted continuously). At this the Messenger of Allah (peace and blessings be upon him) asked: "Who ordered you to torment yourself like this? Fast one day of the month." I said: O Messenger of Allah, increase it for me. He (peace and blessings be upon him) said: "Then fast two days." I said: Increase it for me further. He (peace and blessings be upon him) said: "Fast three days every month."
Hadith Referenceالمطالب العالية بزوائد المسانيد الثمانية / كتاب الصيام / 1108
Hadith Gradingمحدثین:إسناده حسن
Hadith Takhrij«حکم الحدیث المطالب العالیہ محققاً تنسیق د. سعد بن ناصر بن عبد العزيز الشَّثري- مکتبہ شاملہ :إسناده حسن. » «أخرجه مجمع الزوائد ومنبع الفوائد برقم: 4589»