Chapter 16. The Ghazwa of Al-Khandaq which is called Al-Ahzab Battle.
1626. Narrated Jabir (may ALLAH be pleased with him): We were digging (the trench) on the day of Al-Khandaq and we came across a big solid rock. We went to the Prophe (peace be upon him) and said, “Here is the rock appearing across the trench.” He said, “I am coming down.” Then he got up, and a stone was tied to his belly for we had not eaten anything for three days. So the Prophet (peace be upon him) took the spade and struck the big solid rock and it became like sand.