Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
ahmad:22541Muḥammad b. Jaʿfar > Saʿīd > Qatādah > Ghaylān b. Jarīr > ʿAbdullāh b. Maʿbad al-Zimmānī > Abū Qatādah al-Anṣārī

[Machine] That an Arab man asked the Messenger of Allah ﷺ about his fasting, and he mentioned the hadeeth except that he said, "Fasting on Monday?" He said, "That is the day on which I was born and on which the revelation was sent down to me."  

أحمد:٢٢٥٤١حَدَّثَنَا مُحَمَّدُ بْنُ جَعْفَرٍ حَدَّثَنَا سَعِيدٌ عَنْ قَتَادَةَ عَنْ غَيْلَانَ بْنِ جَرِيرٍ عَنْ عَبْدِ اللهِ بْنِ مَعْبَدٍ الزِّمَّانِيِّ عَنْ أَبِي قَتَادَةَ الْأَنْصَارِيِّ

أَنَّ أَعْرَابِيًّا سَأَلَ رَسُولَ اللهِ ﷺ عَنْ صَوْمِهِ فَذَكَرَ الْحَدِيثَ إِلَّا أَنَّهُ قَالَ صَوْمُ الِاثْنَيْنِ؟ قَالَ ذَاكَيَوْمٌ وُلِدْتُ فِيهِ وَأُنْزِلَ عَلَيَّ فِيهِ