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
suyuti:21974a –
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السيوطي:٢١٩٧٤a –

"مَنْ صَامَ يَوْمًا مِنَ المُحَرَّم فَلَهُ بكُلِّ يَوْمٍ ثَلاثُونَ حَسَنَةً".  

[طب] الطبرانى في الكبير عن ابن عباس

See similar narrations below:

Collected by Ṭabarānī
tabarani:11082 – Muḥammad b. Ruzayq b. Jāmiʿ > al-Haytham b. Ḥabīb > Sallām al-Ṭawīl > Ḥamzah al-Zayyāt > Layth > Mujāhid > Ibn ʿAbbās

[Machine] The Messenger of Allah ﷺ said, "Whoever fasts for two days of Muharram, he will be rewarded with thirty good deeds for each day."  

الطبراني:١١٠٨٢ – حَدَّثَنَا مُحَمَّدُ بْنُ رُزَيْقِ بْنِ جَامِعٍ ثنا الْهَيْثَمُ بْنُ حَبِيبٍ ثنا سَلَّامُ الطَّوِيلُ عَنْ حَمْزَةَ الزَّيَّاتِ عَنْ لَيْثٍ عَنْ مُجَاهِدٍ عَنِ ابْنِ عَبَّاسٍ قَالَ

قَالَ رَسُولُ اللهِ ﷺ «مَنْ صَامَ يَوْمَانِ مِنَ الْمُحَرَّمِ فَلَهُ بِكُلِّ يَوْمٍ ثَلَاثِينَ حَسَنَةً»