Uqbah bin Amir al-Juhani (may Allah be pleased with him) said: I heard the Messenger of Allah (peace and blessings be upon him) saying: "Allah Almighty will admit three people to Paradise because of a single arrow: the one who makes it, intending reward, the one who shoots it, and the one who assists him."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الضحايا / 19732