It is narrated from Sayyiduna Abu Ayyub (may Allah be pleased with him), the Messenger of Allah (peace and blessings be upon him) said: Surely, cities will be conquered for you, then (for jihad) there will be a need to send many armies, but a man will refuse to go in that army, then he will leave his people and present himself to other tribes and say: For such and such army, who will suffice for me? Beware! This person will remain a laborer until the last drop of his blood is shed.