Mishkat al-Masabih #2741

He said that God's Messenger once came upon a heap of grain, and when he put his hand into it his fingers felt some dampness, so he asked the owner of the grain how that came about. On being told that rain had fallen on it he said, "Why did you not put the damp part on the top of the grain so that people might see it? He who deceives has nothing to do with me." Muslim transmitted it.