Question: “Due to the laxity of the store, the change that was supposed to be given to the consumer was less than it’s actual amount, and the consumer trusted the cashier so much, he just left the store without checking his change. Since there were big numbers of consumers, the cashier found it hard to remember which consumer had their change lack. What should he do with the rest of that change?
Answer: “The basic ruling for other people’s wealth is forbidden (for others to take) and it should not be used but with the owner’s permission, based on a saying of the Prophet :
لاَ يَحِلُّ مَالُ امْرِئٍ مُسْلِمٍ إِلاَّ بِطِيبِ نَفْسٍ مِنْهُ
“It is unlawful to spend other’s wealth but by his willingness.” (Narrated by Ahmad, from Anas Ibn Malik. It is classed sahih by Al Albani in his work ‘Al Irwa’, hadoth no. 1459 and Shahih al Jami’, hadith no. 7539)
إِنَّ دِمَاءَكُمْ وَأَمْوَالَكُمْ وَأَعْرَاضَكُمْ حَرَامٌ عَلَيْكُمْ…
“Indeed, blood, property and honor of the Muslims is forbidden to be disturbed. “ (Narrated by Bukhari and Muslim, from Abu Bakrah)