Ubaydullah had come accompanied with his retainer Mehran. While Shareek had told Muslim that when he would ask for water, Muslim should come and strike a blow at Ubaydullah. Ubaydullah came and sat near Shareek on his bed and his retainer Mehran stood behind him near his head. Shareek asked for water, and when the maid was bringing water, her sight fell on Muslim who was hiding in ambush and she moved away.
He again asked for water but with no response, and for the third time he asked and said,
“Woe to you! You do not give me water. Give me the water even if it results in my death.”
Mehran understood and he signaled Ubaydullah, to which he too arose to leave. Shareek said that he desired to will to Ubaydullah, to which he replied that he would come some other time and left. Mehran took him away hurriedly and said,
“By Allah, they had desired to kill you.”
Ubaydullah replied,
“How could they do this when I respect and am kind to Shareek, and that too in the house of Hani, whom my father had favored”?
Mehran said,
“Whatever I have said is true.”
(Kamil) When Ubaydullah left, Muslim came out of his hiding and Shareek asked him as to what stopped him from killing Ubaydullah. Muslim replied,
“Two things stopped me from doing so. First because Hani does not approve that Ubaydullah should be killed in his house, and second because of the Tradition related by the Holy Prophet (S) that, “Islam stops from killing anyone unawares and a believer refrains himself from it.”
Reference : Nafasul Mahmoom – Shaikh abbas Qummi (r.a.)