It is in Dur-e-Mukhtar: الحرمة تتعدد مع العلم بها it means that when a thing is known as haram (unlawful), its unlawfulness is transmittable. Therefore, it is not good to start lawful business with money earned by unlawful way. The stolen money must be returned to the owners or his heirs. It is necessary to give the interest money gotten form a bank to the poor.
Allah (Subhana Wa Ta’ala) knows Best
Darul Uloom Deoband