وَعَنْهُ عَنِ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ: لَا تَقُولُوا: الْكَرْمُ فَإِنَّ الْكَرْمَ قَلْبُ الْمُؤمن . رَوَاهُ مُسلم
Abu Huraira (may Allah be pleased with him) narrates from the Prophet (peace and blessings of Allah be upon him), he (peace be upon him) said: "Do not call (grapes) 'karm', for 'karm' is the heart of the believer." Narrated by Muslim.