Abû Hurayra (may Allah be pleased with him) tells it: the Prophet ﷺ passed by a heap of grain.
He put his hand into it. His fingers came out wet.
On the surface, nothing showed. The damp was further in, where only a hand could find it.
He said: “What is this, O owner of the grain?”
The man answered: “The rain fell on it, Messenger of Allah.”
He had not made it rain. The damp was not his doing. And the answer was not about the rain.
He ﷺ said: “Why did you not put it on top of the grain, so that people could see it?”
Then: “Whoever cheats is not of me.”
Not “throw it away”, not “you may not sell it”. Only: put it where the buyer can see.
The word is ghish: letting a buyer believe a thing is better than it really is.
Abû Hurayra also reports the short form: “Whoever cheats us is not one of us.”
In that saying, cheating stands right after taking up arms against the Muslims. That is its weight.
These words were not said of an enemy. They were said of a man selling grain.
And at the heap, there is no “us”: whoever cheats. Anyone, cheating anyone.
A heap of grain. From the outside, dry and good. Underneath, something else.
What did the Prophet ﷺ find in it, and why do his words still reach every seller?
A wet hand, a short question, and a sentence that has followed every seller since.
The man had done nothing wrong to the grain. Only to the buyer, by where he put it.
Tonight, take one thing you sell or offer, and ask: where is its wet grain?