Musannaf Ibn Abi Shaybah 39572 — The Battle of the Trench

It is narrated from Sayyidah Asma bint Yazid bin al-Sakan (may Allah be pleased with her) that when the funeral of Sayyiduna Sa'd (may Allah be pleased with him) was taken out, his mother let out a cry. The Messenger of Allah (peace and blessings be upon him) said to the mother of Sayyiduna Sa'd: "Will your tears not stop and your grief not go away, when your son is the first person at whom Allah Almighty laughed, and for whom the Throne shook?"