Musannaf Ibn Abi Shayba 33:72

Affan narrated to us, he said: Hatim ibn Wardan narrated to us, he said: Yunus narrated to us, from al-Hasan, he said: Musa asked for a comprehensive [piece of] work, and it was said to him: "Look at what you would want people to accompany you with, then accompany the people with it."