Musannaf Ibn Abi Shaybah

It is narrated from Hazrat Anas that on the day of Badr, my aunt's son Harithah went with the Holy Prophet (peace and blessings be upon him). And this boy had gone merely to watch; he had not gone to fight. He was struck by an arrow, and it killed him. So his mother, who was my aunt, came to the Holy Prophet (peace and blessings be upon him) and said: O Messenger of Allah (peace and blessings be upon him)! If my son Harithah is in Paradise, then I will be patient and hope for reward. Otherwise, you will see what I do. The Prophet (peace and blessings be upon him) said: O Umm Harithah! Listen! There are many gardens in Paradise, but Harithah is in the highest Firdaus (Paradise), may Allah be pleased with him.