Mishkat al-Masabih 11 Business Transactions كتاب البيوع 200

وَعَنْهُ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «إِذَا اخْتَلَفْتُمْ فِي الطَّرِيقِ جُعِلَ عرضه سَبْعَة أَذْرع» . رَوَاهُ مُسلم

He reported God’s Messenger as saying, “When you disagree about a road its breadth should be made seven cubits.” Muslim transmitted it.