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.
tabarani:6288Muḥammad b. Yaḥyá al-Qazzāz > al-Qaʿnabī > Ḥātim > Yazīd b. Abū ʿUbayd > Salamah

[Machine] Al-Qa'nabi narrated that Hatim narrated from Yazid ibn Abi 'Ubaid from Salamah that the Messenger of Allah ﷺ sent a caller on the day of Ashura, calling out, "Whoever did not fast, let him complete the rest of his day, and whoever fasted, let him complete his fast."  

الطبراني:٦٢٨٨حَدَّثَنَا مُحَمَّدُ بْنُ يَحْيَى الْقَزَّازُ

ثنا الْقَعْنَبِيُّ ثنا حَاتِمٌ عَنْ يَزِيدَ بْنِ أَبِي عُبَيْدٍ عَنْ سَلَمَةَ أَنَّ رَسُولَ اللهِ ﷺ بَعَثَ مُنَادِيًا يَوْمَ عَاشُورَاءَ يُنَادِي «مَنْ كَانَ لَمْ يَصُمْ فَلْيُتِمَّ بَقِيَّةَ يَوْمِهِ وَمَنْ صَامَ فَلْيُتِمَّ صَوْمَهُ»