It is narrated from Sayyiduna Sahl bin Sa’d Sa’idi (may Allah be pleased with him), he says: I was with the Noble Prophet (peace and blessings be upon him) at the time of digging the trench. The Prophet (peace and blessings be upon him) took a pickaxe and began to dig with it. Suddenly, a rock appeared in front. At that moment, the Prophet (peace and blessings be upon him) laughed. Someone asked: O Messenger of Allah! What made you laugh? The Prophet (peace and blessings be upon him) replied: I laughed because of those people who will be brought in chains from the East and will be led towards Paradise.