Where there is no fixed judgement, the traditions and conventions of community are to be referred Sahih al-Bukhari 2211
Arabic hadith text
حَدَّثَنَا أَبُو نُعَيْمٍ، حَدَّثَنَا سُفْيَانُ، عَنْ هِشَامٍ، عَنْ عُرْوَةَ، عَنْ عَائِشَةَ ـ رضى الله عنها ـ قَالَتْ هِنْدٌ أُمُّ مُعَاوِيَةَ لِرَسُولِ اللَّهِ صلى الله عليه وسلم إِنَّ أَبَا سُفْيَانَ رَجُلٌ شَحِيحٌ، فَهَلْ عَلَىَّ جُنَاحٌ أَنْ آخُذَ مِنْ مَالِهِ سِرًّا قَالَ "خُذِي أَنْتِ وَبَنُوكِ مَا يَكْفِيكِ بِالْمَعْرُوفِ "
Translation
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."