Hadith.3147 - It is narrated that Al-‘Ays ibn Al-Qasim asked Abu Abdullah (as) about performing ghusl (ritual purification) at al-Mu'arras.
Imam (as) said
"You are not required to perform ghusl there. Ta'ris (staying briefly at al-Mu'arras) is to pray there and lie down, whether passing by during the night or the day."