Musnad Ahmad Hadith 13658

It is narrated from Anas (may Allah be pleased with him) that my name was given after my uncle Anas bin Nadr, who could not participate in the Battle of Badr with the Prophet (ﷺ), and he regretted it. He used to say that I could not participate in the first battle with the Prophet (ﷺ), but if now Allah gives me the opportunity to go in any battle with the Prophet (ﷺ), then Allah will see what I do. Thus, he participated in the Battle of Uhud with the Prophet (ﷺ). In the battlefield, he saw Sa’d bin Mu’adh (may Allah be pleased with him) coming from in front of him. He said to him, "Abu Amr! Where are you going? By Allah! I can smell the fragrance of Paradise from behind Uhud." Saying this, he fought so bravely that he was eventually martyred, and more than eighty marks of spears, swords, and arrows were found on his body. His sister and my paternal aunt, Rubai’ bint Nadr, says that I could only recognize my brother by his fingertips. And in this context, this verse was revealed: "Among the believers are men who have been true to their covenant with Allah; some of them have fulfilled their vow, and some are still waiting." The companions (may Allah be pleased with them) believed that this verse was revealed about Anas (may Allah be pleased with him) and other companions like him.