Musannaf Ibn Abi Shayba 33:381

Jarir narrated to us, from Mansur, from Salim, who said: A man climbed up to Abu al-Darda’ while he was sitting on top of a house picking up grains. He said: The man felt shy before him and turned back. So Abu al-Darda’ said: "Come, for indeed, part of your understanding (fiqh) is your gentleness regarding your livelihood."