(95) بَابُ مَنْ أَجْرَى أَمْرَ الأَمْصَارِ عَلَى مَا يَتَعَارَفُونَ بَيْنَهُمْ فِي الْبُيُوعِ وَالإِجَارَةِ وَالْمِكْيَالِ، وَالْوَزْنِ، وَسُنَنِهِمْ عَلَى نِيَّاتِهِمْ وَمَذَاهِبِهِمِ الْمَشْهُورَةِ
Narrated `Aisha:
Hind, the mother of Mu'awiya said to Allah's Messenger (ﷺ), "Abu Sufyan (her husband) is a miser. Am I allowed to take from his money secretly?" The Prophet (ﷺ) said to her, "You and your sons may take what is sufficient reasonably and fairly."
Reference: Sahih al-Bukhari 2211
In-book reference: Book 34, Hadith 157
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 3, Book 34, Hadith 413