Musnad Ahmad 32:602

'Abd al-Samad narrated to us, Hammad narrated to us, from Thabit, from Anas, who said: The Messenger of Allah (peace and blessings of Allah be upon him) heard some sounds and said: "What is this?" They said: "They are pollinating the palm trees." He said: "If they were to leave it and not pollinate them, it would still be good." So they left it and did not pollinate them, and it produced poor-quality dates (shis). The Prophet (peace and blessings of Allah be upon him) said: "What is the matter with you?" They said: "We left it because of what you said." The Messenger of Allah (peace and blessings of Allah be upon him) said: "If it is something regarding your worldly affairs, then you are more knowledgeable about it, but if it is regarding your religion, then [refer it] to me."