Hadith.2983 - Imam Jafar ibn Muhammad Al-Sadiq عليه السلام said:
"My father عليه السلام used to stand at Al-Mash'ar al-Haram where he would spend the night."
It is recommended for someone performing Hajj for the first time (Sarrurah) to step on Al-Mash'ar with his foot or his camel.
It is also recommended for someone performing Hajj for the first time (Sarrurah) to enter the Ka'bah.