Staying at Al-Mahassab is not one of the ceremonies (of Hajj), but Al-Mahassab is a place where Messenger of Allah ﷺ camped (during his Hajjat-al-Wida).
عَنِ ابْنِ عَبَّاسٍ ؓ لَيْسَ التَّحْصِيبُ بِشَىْءٍ إِنَّمَا هُوَ مَنْزِلٌ نَزَلَهُ رَسُولُ اللَّهِ ﷺ
Halt at Muhassab is not something (significant from the point of view of the Shari'ah). It is a place of halt where Messenger of Allah (way peace be upon him) halted.
لَيْسَ التَّحْصِيبُ بِشَىْءٍ إِنَّمَا هُوَ مَنْزِلٌ نَزَلَهُ رَسُولُ اللَّهِ ﷺ
"At-Tahsib is nothing, it is only a place that the Messenger of Allah camped at."
لَيْسَ التَّحْصِيبُ بِشَيْءٍ إِنَّمَا هُوَ مَنْزِلٌ نَزَلَهُ رَسُولُ اللَّهِ ﷺ
"At-Tahsib is nothing, it is only a place that the Messenger of Allah camped at." (Using translation from Tirmidhī 922)
لَيْسَ الْمُحَصَّبُ بِشَيْءٍ إِنَّمَا هُوَ مَنْزِلٌ نَزَلَهُ رَسُولُ اللهِ ﷺ
[Machine] Ibn Abbas said: "It is merely a place where the Messenger of Allah ﷺ descended," referring to Al-Abtah.
ابْنُ عَبَّاسٍ «إِنَّمَا هُوَ مَنْزِلٌ نَزَلَهُ رَسُولُ اللهِ ﷺ» يَعْنِي الْأَبْطَحَ
"At-Tahsib is nothing, it is only a place that the Messenger of Allah camped at." (Using translation from Tirmidhī 922)
«لَيْسَ الْمُحَصَّبُ شَيْءٌ إِنَّمَا هُوَ مَنْزِلٌ نَزَلَهُ رَسُولُ اللهِ ﷺ»
Halt at Muhassab is not something (significant from the point of view of the Shari'ah). It is a place of halt where Messenger of Allah (way peace be upon him) halted. (Using translation from Muslim 1312)
«إِنَّ الْمُحَصَّبُ لَيْسَ بِشَيْءٍ إِنَّمَا هُوَ مَنْزِلٌ نَزَلَهُ رَسُولُ اللهِ ﷺ»