Sunan Ibn Majah — The Chapters on Pawning — Hadith No: 2470
Translation
It was narrated from Simak that the heard Musa bin Talhah bin `Ubaidullah narrating that his father said:“I passed by some palm trees with the Messenger of Allah (ﷺ) and he saw some people pollinating the trees. He said: 'What are these people doing?' They said: 'They are taking something from the male part (of the plant) and putting it in the female part.' He said: 'I do not think that this will do any good.' News of that reached them, so they stopped doing it, and their yield declined. News of that reached the Prophet (ﷺ) and he said: 'That was only my thought. If it will do any good, then do it. I am only a human being like you, and what I think may be right or wrong. But When I tell you: “Allah (SWT) says,” I will never tell lies about Allah (SWT).' ”