Worst provision is oppressing others
Nahj al-Balāgha|Volume 1|Book 3|Chapter 221
٢٢١. وَقَالَ (عليه السلام): بِئْسَ الزَّادُ إِلَى الْمَعَادِ الْعُدْوَانُ عَلَى الْعِبَادِ.
221. Amīr al-mu’minīn, peace be upon him, said: The worst provision for the Day of Judgement is high-handedness over people.