Sayyidina Abu Hurayrah (RA) reported that Allah’s Messenger (SAW) passed by a heap of grain. He put his hand into it and his fingers detected some dampness in it. He asked, ‘0 owner of the provision, what is this?” He said, “0 Messenger of Allah, it is from rain from the sky. He said, “Then why did you not put it on top of the heap of grain that people might see? He added, “He who deceives is not one of us.”
[Abu Dawud 3452]