Sayyiduna Ubadah bin Samit (may Allah be pleased with him) narrates that the Messenger of Allah (peace and blessings be upon him) said: "Gold for gold should be equal for equal, and silver for silver should be equal for equal, until he made a special mention of salt as well." Sayyiduna Ubadah (may Allah be pleased with him) says: "By Allah! I do not care whether I am in the region of Muawiyah or not." Marwan says: "Both narrators gave it special importance that I should mention salt."
Hadith Referenceالمنتقى ابن الجارود / كتاب البيوع والتجارات / 652
Hadith Gradingغلام مصطفےٰ ظهير امن پوري:إسناده صحيح
Hadith Takhrijاز غلام مصطفےٰ ظهير امن پوري:«إسناده صحيح : مسند الإمام أحمد : 319/5، سنن النسائي : 4570»