Silsilah as-Sahihah 3997 — People of Hell will weep blood

It is narrated from Sayyiduna Abdullah bin Qais (may Allah be pleased with him) that the Messenger of Allah (peace and blessings of Allah be upon him) said: "The people of Hell will weep so much (and shed so many tears) that if boats were to be sailed in them, they would float. Instead of tears of water, they will weep tears of blood."