Narrated Abu Hurairah (RA):

Allah's Messenger (ﷺ) once came upon a heap of grain, and when he put his hand inside it, his fingers felt some dampness. So, he asked, "What is this, O owner of the grain?" He replied, "Rain had fallen on it, O Allah's Messenger (ﷺ) ." He said, "Why did you not put it (the damp part) on the top of the foodstuff so that people might see it? Whoever cheats has nothing to do with me." [Reported by Muslim].

وَعَنْ أَبِي هُرَيْرَةَ ‏- رضى الله عنه ‏- { أَنَّ رَسُولَ اَللَّهِ ‏- صلى الله عليه وسلم ‏-مَرَّ عَلَى صُبْرَةِ طَعَامٍ, فَأَدْخَلَ يَدَهُ فِيهَا, فَنَالَتْ أَصَابِعُهُ بَلَلًا , فَقَالَ:

مَا هَذَا يَا صَاحِبَ اَلطَّعَامِ?

قَالَ: أَصَابَتْهُ اَلسَّمَاءُ يَا رَسُولَ اَللَّهِ.‏ فَقَالَ: أَفَلَا جَعَلْتَهُ فَوْقَ اَلطَّعَامِ; كَيْ يَرَاهُ اَلنَّاسُ? مَنْ غَشَّ فَلَيْسَ مِنِّي } رَوَاهُ مُسْلِمٌ [1]‏ .‏