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.
suyuti:430-219bIbn Masʿūd
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السيوطي:٤٣٠-٢١٩b

"عَنِ ابنِ مَسْعُودٍ قَالَ: كانَ عَاشُوَراءُ يَوْمًا يَصُومُهُ رَسُولُ اللهِ ﷺ قَبْلَ أَنْ يَنْزِلَ رَمَضَانُ ثُمَّ تَركَهُ".  

ابن جرير

See similar narrations below:

Collected by Suyūṭī
suyuti:430-220bIbn Masʿūd
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السيوطي:٤٣٠-٢٢٠b

"عَنِ ابنِ مَسْعُودٍ قَالَ: عَاشُورَاءُ يَوْمٌ كُنَّا نَصُومُهُ قَبْلَ أَنْ يَنْزِلَ رَمَضَانُ فَلَمَّا نَزَلَ رَمَضَانُ صُمْنَاهُ وَتَركْنَا مَا سِوَاهُ".  

ابن جرير