Kitab al-Fitan of Nu'aym ibn Hammad: ungraded, and weak overall. Never established on its own.
ليأتين عليكم يوم يمشي أحدكم إلى قبر أخيه فيقول: يا ليتني مكانه
A day will come upon you when one of you walks to his brother's grave and says: I wish I were in his place