Sayyiduna Anas bin Malik (may Allah be pleased with him) narrates: Some young men from among the Ansar, who were called the reciters (Qari), used to live on the outskirts of Madinah Munawwarah. Their families thought they were in the mosque, and the people of the mosque thought they were at home. These people would spend the night performing voluntary prayers, and when morning approached, they would gather firewood and fetch sweet water, and place these things at the doors of the chambers of the Prophet Muhammad (peace and blessings be upon him). The Prophet Muhammad (peace and blessings be upon him) sent all of them towards Bi’r Ma’unah, and there they were all martyred. The Prophet Muhammad (peace and blessings be upon him) supplicated against their killers for several days.