Husayn bin Abi al-Hurr (may Allah have mercy on him) narrates: I came to Sayyiduna Abu Musa al-Ash'ari (may Allah be pleased with him) on a Friday while he was eating his midday meal. He invited me to join him in the meal, and I said: I am fasting. At that he (may Allah be pleased with him) said: "Never fast a day which you make (on a permanent basis) binding and obligatory upon yourself."
Hadith Referenceالمطالب العالية بزوائد المسانيد الثمانية / كتاب الصيام / 1050
Hadith Gradingمحدثین:إسناده صحيح
Hadith Takhrij«حکم الحدیث المطالب العالیہ محققاً تنسیق د. سعد بن ناصر بن عبد العزيز الشَّثري- مکتبہ شاملہ :رجاله ثقات. » «انفرد به المصنف من هذا الطريق»