The heart that harbours the most rancour is the heart of the malicious person.
الغِلُّ يُحبِطُ الحَسَناتِ . ح: 642
Rancour thwarts good deeds. H: 642
أشَدُّ القُلوبِ غِلّاً قَلبُ الحَقُودِ. ح: 2932
The heart that harbours the most rancour is the heart of the malicious person. H: 2932