It is a day when the people in the pre-Islamic days need to observe fast, so he who wishes to observe fast should do so, and he who wishes to abandon it should do so.
ذُكِرَ عِنْدَ رَسُولِ اللَّهِ ﷺ يَوْمُ عَاشُورَاءَ فَقَالَ ذَاكَ يَوْمٌ كَانَ يَصُومُهُ أَهْلُ الْجَاهِلِيَّةِ فَمَنْ شَاءَ صَامَهُ وَمَنْ شَاءَ تَرَكَهُ
That was a day on which the people of pre-Islamic days used to observe fast. So he who amongst you likes to observe fast should do so, and he who does not like it should abandon it.
أَنَّهُ ذُكِرَ عِنْدَ رَسُولِ اللَّهِ ﷺ يَوْمُ عَاشُورَاءَ فَقَالَ رَسُولُ اللَّهِ ﷺ كَانَ يَوْمًا يَصُومُهُ أَهْلُ الْجَاهِلِيَّةِ فَمَنْ أَحَبَّ مِنْكُمْ أَنْ يَصُومَهُ فَلْيَصُمْهُ وَمَنْ كَرِهَ فَلْيَدَعْهُ
“That was a day when the people of the Ignorance used to fast. So whoever among you wants to fast may do so, and whoever does not want to may leave it.”
أَنَّهُ ذُكِرَ عِنْدَ رَسُولِ اللَّهِ ﷺ يَوْمُ عَاشُورَاءَ فَقَالَ رَسُولُ اللَّهِ ﷺ كَانَ يَوْمًا يَصُومُهُ أَهْلُ الْجَاهِلِيَّةِ فَمَنْ أَحَبَّ مِنْكُمْ أَنْ يَصُومَهُ فَلْيَصُمْهُ وَمَنْ كَرِهَهُ فَلْيَدَعْهُ
[Machine] The Messenger of Allah ﷺ mentioned the Day of Ashura and said, "The people of pre-Islamic ignorance used to observe fasting on this day, so whoever wishes may fast and whoever wishes may break his fast."
ذَكَرَ رَسُولُ اللهِ ﷺ عَاشُورَاءَ فَقَالَ «كَانَ صَوْمَ أَهْلِ الْجَاهِلِيَّةِ فَمَنْ شَاءَ صَامَ وَمَنْ شَاءَ أَفْطَرَ»
“That was a day when the people of the Ignorance used to fast. So whoever among you wants to fast may do so, and whoever does not want to may leave it.” (Using translation from Ibn Mājah 1737)
أَنَّهُ ذُكِرَ عِنْدَ رَسُولِ اللهِ ﷺ يَوْمُ عَاشُورَاءَ فَقَالَ رَسُولُ اللهِ ﷺ «كَانَ يَوْمًا يَصُومُهُ أَهْلُ الْجَاهِلِيَّةِ فَمَنْ أَحَبَّ مِنْكُمْ أَنْ يَصُومَهُ فَلْيَصُمْهُ وَمَنْ كَرِهَهُ فَلْيَدَعْهُ»