عَنْ أَبِي هُرَيْرَةَ عَنْ رَسُولِ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ:" الْخَمْرُ مِنْ هَاتَيْنِ الشَّجرتينِ: النخلةِ والعِنَبَةِ ". رَوَاهُ مُسلم

Anas told that the Prophet was asked about wine which was turned into vinegar* and forbade it. Muslim transmitted it.* This is said to have been done by putting onions or salt in it, or by placing it in the sun.