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.
Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
nasai-kubra:2790 – ʿAmr b. ʿAlī > ʿAbd al-Raḥman b. Mahdī > Mahdī b. Maymūn > Ghaylān b. Jarīr > ʿAbdullāh b. Maʿbad al-Zimmānī > Abū Qatādah

[Machine] That the messenger of Allah ﷺ was asked about fasting on Mondays. He said, "It is the day I was born and the day I received revelation."  

الكبرى للنسائي:٢٧٩٠ – أَخْبَرَنَا عَمْرُو بْنُ عَلِيٍّ قَالَ حَدَّثَنَا عَبْدُ الرَّحْمَنِ بْنُ مَهْدِيٍّ قَالَ حَدَّثَنَا مَهْدِيُّ بْنُ مَيْمُونٍ عَنْ غَيْلَانَ بْنِ جَرِيرٍ عَنْ عَبْدِ اللهِ بْنِ مَعْبَدٍ الزِّمَّانِيِّ عَنْ أَبِي قَتَادَةَ

أَنَّ رَسُولَ اللهِ ﷺ سُئِلَ عَنْ صَوْمِ يَوْمِ الِاثْنَيْنِ قَالَ «هُوَ يَوْمٌ وُلِدْتُ فِيهِ وَيَوْمٌ أُنْزِلَ عَلَيَّ فِيهِ»  

See similar narrations below:

Collected by Muslim, Aḥmad
muslim:1162e – Zuhayr b. Ḥarb > ʿAbd al-Raḥman b. Mahdī > Mahdī b. Maymūn > Ghaylān > ʿAbdullāh b. Maʿbad al-Zimmānī from my father

It is (the day) when I was born and revelation was sent down to me.  

مسلم:١١٦٢e – وَحَدَّثَنِي زُهَيْرُ بْنُ حَرْبٍ حَدَّثَنَا عَبْدُ الرَّحْمَنِ بْنُ مَهْدِيٍّ حَدَّثَنَا مَهْدِيُّ بْنُ مَيْمُونٍ عَنْ غَيْلاَنَ عَنْ عَبْدِ اللَّهِ بْنِ مَعْبَدٍ الزِّمَّانِيِّ عَنْ أَبِي قَتَادَةَ الأَنْصَارِيِّ ؓ

أَنَّ رَسُولَ اللَّهِ ﷺ سُئِلَ عَنْ صَوْمِ الاِثْنَيْنِ فَقَالَ فِيهِ وُلِدْتُ وَفِيهِ أُنْزِلَ عَلَىَّ  

ahmad:22550 – ʿAbd al-Raḥman b. Mahdī > Ghaylān b. Jarīr > ʿAbdullāh b. Maʿbad > Abū Qatādah

[Machine] The Messenger of Allah ﷺ was asked about fasting on Monday. He replied, "On this day, I was born and on this day, revelation was sent down to me."  

أحمد:٢٢٥٥٠ – حَدَّثَنَا عَبْدُ الرَّحْمَنِ بْنُ مَهْدِيٍّ عَنْ غَيْلَانَ بْنِ جَرِيرٍ عَنْ عَبْدِ اللهِ بْنِ مَعْبَدٍ عَنْ أَبِي قَتَادَةَ قَالَ

سُئِلَ رَسُولُ اللهِ ﷺ عَنْ صَوْمِ يَوْمِ الْإِثْنَيْنِ؟ فَقَالَ فِيهِ وُلِدْتُ وَفِيهِ أُنْزِلَ عَلَيَّ