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:2430 – Muḥammad b. ʿAbd al-Aʿlá > Khālid > Shuʿbah > Anas b. Sīrīn > a man Yuqāl Lah ʿAbd al-Malik from his father

the Messenger of Allah used to enjoin (fasting) these days of Al-Bid and he said: "That is (equivalent to) fasting for the whole month."  

النسائي:٢٤٣٠ – أَخْبَرَنَا مُحَمَّدُ بْنُ عَبْدِ الأَعْلَى قَالَ حَدَّثَنَا خَالِدٌ عَنْ شُعْبَةَ قَالَ أَنْبَأَنَا أَنَسُ بْنُ سِيرِينَ عَنْ رَجُلٍ يُقَالُ لَهُ عَبْدُ الْمَلِكِ يُحَدِّثُ عَنْ أَبِيهِ

أَنَّ رَسُولَ اللَّهِ ﷺ كَانَ يَأْمُرُ بِهَذِهِ الأَيَّامِ الثَّلاَثِ الْبِيضِ وَيَقُولُ هُنَّ صِيَامُ الشَّهْرِ  

See similar narrations below:

Collected by Nasāʾī's Kubrá
nasai-kubra:2750 – Muḥammad b. ʿAbd al-Aʿlá > Khālid > Shuʿbah Anbʾanā Anas b. Sīrīn > a man Yuqāl Lah ʿAbd al-Malik from his father

the Messenger of Allah used to enjoin (fasting) these days of Al-Bid and he said: "That is (equivalent to) fasting for the whole month." (Using translation from Nasāʾī 2430)  

الكبرى للنسائي:٢٧٥٠ – أَخْبَرَنَا مُحَمَّدُ بْنُ عَبْدِ الْأَعْلَى قَالَ حَدَّثَنَا خَالِدٌ عَنْ شُعْبَةَ أَنبأَنا أَنَسُ بْنُ سِيرِينَ عَنْ رَجُلٍ يُقَالُ لَهُ عَبْدُ الْمَلِكِ يُحَدِّثُ عَنْ أَبِيهِ

أَنَّ رَسُولَ اللهِ ﷺ كَانَ يَأْمُرُ بِهَذِهِ الْأَيَّامِ الثَّلَاثِةِ الْبِيضِ وَيَقُولُ «هُنَّ صِيَامُ الشَّهْرِ»  

nasai-kubra:2751 – Muḥammad b. Ḥātim > Ḥibbān > ʿAbdullāh > Shuʿbah > Anas b. Sīrīn > ʿAbd al-Malik b. Abū al-Minhāl from his father

the Prophet commanded them to fast the three days of Al-Bid. He said: "That is (equivalent to) fasting for the whole month." (Using translation from Nasāʾī 2431)  

الكبرى للنسائي:٢٧٥١ – أَخْبَرَنَا مُحَمَّدُ بْنُ حَاتِمٍ قَالَ أَخْبَرَنَا حِبَّانُ قَالَ أَخْبَرَنَا عَبْدُ اللهِ عَنْ شُعْبَةَ عَنْ أَنَسِ بْنِ سِيرِينَ قَالَ سَمِعْتُ عَبْدَ الْمَلِكِ بْنَ أَبِي الْمِنْهَالِ يُحَدِّثُ عَنْ أَبِيهِ

أَنَّ النَّبِيَّ ﷺ أَمَرَهُمْ بِصِيَامِ ثَلَاثَةِ أَيَّامٍ الْبِيضِ وَقَالَ «هُنَّ صَوْمُ الشَّهْرِ»