Sahih Muslim 677k

Muhammad ibn Hatim narrated to us; Affan narrated to us; Hammad narrated to us; Thabit informed us, from Anas ibn Malik, who said: Some people came to the Prophet, peace and blessings be upon him, and said, “Send men with us to teach us the Quran and Sunnah.” He sent seventy men from the Ansar, called the Reciters. Among them was my maternal uncle Haram. They recited the Quran and studied it together at night, learning. During the day they brought water and placed it in the mosque, gathered firewood and sold it, and bought food with the proceeds for the people of the Bench and the poor. The Prophet sent them with those people, but the latter ambushed and killed them before they reached their destination. The Reciters said, “O Allah, convey from us to our Prophet that we have met You, are pleased with You, and You are pleased with us.” A man came upon Haram, the maternal uncle of Anas, from behind and pierced him through with a spear. Haram said, “By the Lord of the Kabah, I have succeeded!” The Messenger of Allah, peace and blessings be upon him, said to his Companions: “Your brothers have been killed, and they said: O Allah, convey from us to our Prophet that we have met You, are pleased with You, and You are pleased with us.”