It is narrated from Sayyiduna Wa'il bin Hujr (may Allah be pleased with him) that the Prophet (peace and blessings of Allah be upon him) said: "None of you should ever say: 'Karam,' rather you should say 'Hablah,' meaning grapes."
Hadith Referenceالادب المفرد / كتاب الأقوال / 795
Hadith Gradingالألبانی:صحيح
Hadith Takhrij«صحيح : أخرجه مسلم ، كتاب الألفاظ : 2248»