In Al-Seyed Nasih al-Din it is narrated that Imam Reza (a.s) narrated on the authority of his father (a.s) that Ameer al- Momineen (a.s) quoted the Prophet of God (a.s)
“Avoid oppressing (others) since it will spiritually ruin your heart.”
من مجموع السيد ناصح الدين أبي البركات: عن الرضا عن أبيه عن أمير المؤمنين (عليهم السلام) قال
قال رسول الله (صلى الله عليه وآله): إياكم والظلم فإنه يخرب قلوبكم.
Similar narrations
Mīzān al-Ḥikma #4625The Prophet (SAWA) said, ‘Beware of wrongdoing for verily it corrupts your hearts.