The Messenger of Allah ﷺ alighted at al-Muhassab so that it might be easier for him to proceed (to Medina). It is not a sunnah (i.e. a rite of Hajj). Anyone who desires may alight there, and anyone who does not want may not alight. (Using translation from Abū Dāʾūd 2008)
«الْمُحَصَّبُ لَيْسَ بِسُنَّةٍ إِنَّمَا هُوَ مَنْزِلٌ نَزَلَهُ رَسُولُ اللهِ ﷺ لِيَكُونَ أَسْمَحَ لِخُرُوجِهِ»