Harm must not be caused nor reciprocated

“There should be neither harming nor reciprocating harm.”  

أَنَّ رَسُولَ اللَّهِ ﷺ قَضَى أَنْ لاَ ضَرَرَ وَلاَ ضِرَارَ  

“There should be neither harming nor reciprocating harm.”  

قَالَ رَسُولُ اللَّهِ ﷺ لاَ ضَرَرَ وَلاَ ضِرَارَ  

“Whoever harms others, Allah (SWT) will harm him; and whoever causes hardship to other Allah will cause hardship to him.”  

عَنْ رَسُولِ اللَّهِ ﷺ قَالَ مَنْ ضَارَّ أَضَرَّ اللَّهُ بِهِ وَمَنْ شَاقَّ شَقَّ اللَّهُ عَلَيْهِ