He who took up arms against us is not of us and he who acted dishonestly towards us is not of us.  

أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ مَنْ حَمَلَ عَلَيْنَا السِّلاَحَ فَلَيْسَ مِنَّا وَمَنْ غَشَّنَا فَلَيْسَ مِنَّا  

What is this? He replied: Messenger of Allah, these have been drenched by rainfall. He (the Holy Prophet) remarked: Why did you not place this (the drenched part of the heap) over other eatables so that the people could see it? He who deceives is not of me (is not my follower).  

أَنَّ رَسُولَ اللَّهِ ﷺ مَرَّ عَلَى صُبْرَةِ طَعَامٍ فَأَدْخَلَ يَدَهُ فِيهَا فَنَالَتْ أَصَابِعُهُ بَلَلاً فَقَالَ مَا هَذَا يَا صَاحِبَ الطَّعَامِ قَالَ أَصَابَتْهُ السَّمَاءُ يَا رَسُولَ اللَّهِ قَالَ أَفَلاَ جَعَلْتَهُ فَوْقَ الطَّعَامِ كَىْ يَرَاهُ النَّاسُ مَنْ غَشَّ فَلَيْسَ مِنِّي