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.
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السيوطي:١٥١٧٦a

"صُمْ صِيَامَ دَاوُدَ؛ فَإِنَّهُ أَعْدَلُ الصِّيَام عِنْدَ الله: يَوْمًا صَائِمًا وَيَوْمًا مُفْطِرًا، وَإنَّه كَانَ إِذَا وَعَد لَم يُخْلِفْ، وإِذَا لاقَى لمْ يَفِرَّ".  

[ن] النسائي عن ابن عمرو