Ill-gotten gains lead to ruin
Nahj al-Balāgha|Volume 1|Book 3|Chapter 240
٢٤٠. وَقَالَ (عليه السلام): الْحَجَرُ الْغَصِيبُ فِي الدَّارِ رَهْنٌ عَلَى خَرَابِهَا.
240. Amīr al-mu’minīn, peace be upon him, said: One ill-gotten piece of stone in a house is a guarantee for its ruin.