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
ahmad:13158 – Aswad > Abū Bakr > Ḥumayd > Anas

[Machine] The Prophet Muhammad ﷺ observed fasting for twenty days.  

أحمد:١٣١٥٨ – حَدَّثَنَا أَسْوَدُ حَدَّثَنَا أَبُو بَكْرٍ عَنْ حُمَيْدٍ عَنْ أَنَسٍ قَالَ

قَنَتَ رَسُولُ اللهِ ﷺ عِشْرِينَ يَوْمًا  

See similar narrations below:

Collected by Aḥmad, Ibn Ḥibbān, Ṭabarānī
ahmad:13280 – ʿUmar b. Saʿd > Sufyān > ʿĀṣim > Anas

[Machine] The Messenger of Allah ﷺ fasted for a month.  

أحمد:١٣٢٨٠ – حَدَّثَنَا عُمَرُ بْنُ سَعْدٍ عَنْ سُفْيَانَ عَنْ عَاصِمٍ عَنْ أَنَسٍ قَالَ

قَنَتَ رَسُولُ اللهِ ﷺ شَهْرًا  

ahmad:20242 – ʿAbd al-Ṣamad And ʿAffān > Ḥammād b. Salamah > al-Ashʿath b. ʿAbd al-Raḥman al-Jarmī from his father > Samurah b. Jundub > a man

This tradition has also been transmitted by Sa'd (b. Abi Waqqas) from the Prophet ﷺ in a similar manner through a different chain of narrators. (Using translation from Abū Dāʾūd 1470)   

أحمد:٢٠٢٤٢ – حَدَّثَنَا عَبْدُ الصَّمَدِ وَعَفَّانُ قَالَا حَدَّثَنَا حَمَّادُ بْنُ سَلَمَةَ أَخْبَرَنَا الْأَشْعَثُ بْنُ عَبْدِ الرَّحْمَنِ الْجَرْمِيُّ عَنْ أَبِيهِ عَنْ سَمُرَةَ بْنِ جُنْدُبٍ أَنَّ رَجُلًا قَالَ

قَالَ رَسُولُ اللهِ ﷺ  

ذِكْرُ الْبَيَانِ بِأَنَّ قَوْلَ أَنَسٍ الَّذِي ذَكَرْنَاهُ لَمْ يُرِدْ بِهِ النَّفْيَ عَمَّا وَرَاءَ ذَلِكَ الْعَدَدِ

ibnhibban:6294 – Muḥammad b. Zuhayr Bi-al-Ubullah > Muḥammad b. ʿUmar b. al-Walīd al-Kindī > Yaḥyá b. Ādam > Sharīk > ʿUbaydullāh b. ʿUmar > Nāfiʿ > Ibn ʿUmar

“The white hair of the Prophet ﷺ numbered approximately twenty.” (Using translation from Ibn Mājah 3630)  

ابن حبّان:٦٢٩٤ – أَخْبَرَنَا مُحَمَّدُ بْنُ زُهَيْرٍ بِالْأُبُلَّةِ حَدَّثَنَا مُحَمَّدُ بْنُ عُمَرَ بْنِ الْوَلِيدِ الْكِنْدِيُّ حَدَّثَنَا يَحْيَى بْنُ آدَمَ عَنْ شَرِيكٍ عَنْ عُبَيْدِ اللَّهِ بْنِ عُمَرَ عَنْ نَافِعٍ عَنِ ابْنِ عُمَرَ قَالَ

«كَانَ شِيبُ رَسُولِ اللَّهِ ﷺ عِشْرِينَ شَعْرَةً»  

tabarani:9974 – ʿAlī b. ʿAbd al-ʿAzīz > Aḥmad b. Yūnus > Abū Bakr b. ʿAyyāsh > Nuṣayr / Ibn Abū al-Ashʿath > Maymūn Wahū Abū Ḥamzah > Ibrāhīm > ʿAlqamah > ʿAbdullāh

[Machine] The Messenger of Allah ﷺ persisted in calling for thirty days, then he left it.  

الطبراني:٩٩٧٤ – حَدَّثَنَا عَلِيُّ بْنُ عَبْدِ الْعَزِيزِ ثنا أَحْمَدُ بْنُ يُونُسَ ثنا أَبُو بَكْرِ بْنُ عَيَّاشٍ عَنْ نُصَيْرٍ وَهُوَ ابْنُ أَبِي الْأَشْعَثِ عَنْ مَيْمُونٍ وَهُوَ أَبُو حَمْزَةَ عَنْ إِبْرَاهِيمَ عَنْ عَلْقَمَةَ عَنْ عَبْدِ اللهِ قَالَ

«قَنَتَ رَسُولُ اللهِ ﷺ ثَلَاثِينَ يَوْمًا يَدْعُو ثُمَّ تَرَكَهُ»