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

قَوْلُهُ تَعَالَى: {فَمَنْ كَانَ مِنْكُمْ مَرِيضًا أَوْ بِهِ أَذًى مِنْ رَأْسِهِ} [البقرة: 196]

nasai-kubra:10963 – ʿAmr b. ʿAlī > Azhar b. Saʿd > Ibn ʿAwn > Mujāhid > Ibn Abū Laylá > Kaʿb b. ʿUjrah

[Machine] Fasting is for three days, and charity is for six needy people, and the rituals are whatever is easy.  

الكبرى للنسائي:١٠٩٦٣ – أَخْبَرَنَا عَمْرُو بْنُ عَلِيٍّ حَدَّثَنَا أَزْهَرُ بْنُ سَعْدٍ عَنِ ابْنِ عَوْنٍ عَنْ مُجَاهِدٍ عَنِ ابْنِ أَبِي لَيْلَى عَنْ كَعْبِ بْنِ عُجْرَةَ قَالَ فِيَّ أُنْزِلَتْ هَذِهِ الْآيَةُ فَأَتَيْتُ فَقَالَ «ادْنُ» فَدَنَوْتُ فَقَالَ «أَيُؤْذِيكَ هَوَامُّكَ؟» §فَأَمَرَنِي بِصِيَامٍ أَوْ صَدَقَةٍ أَوْ نُسُكٍ قَالَ ابْنُ عَوْنٍ فَفَسَّرَهُ لِي مُجَاهِدٌ فَلَمْ أَحْفَظْهُ فَسَأَلْتُ أَيُّوبَ فَقَالَ

الصِّيَامُ ثَلَاثَةُ أَيَّامٍ وَالصَّدَقَةُ عَلَى سِتَّةِ مَسَاكِينَ وَالنُّسُكُ مَا اسْتَيْسَرَ