Bulugh al-Maram 21
Narrated Abu Tha’laba Al-Khushni:
Narrated  (rad):
I said “O Allah’s Messenger! We are living in a land inhabited by the people of the Scriptures; can we take our meals in their utensils?” He said, “If you can get utensils other than theirs, do not eat in theirs, but if you cannot get other than theirs, wash them and eat in them” [Agreed upon].
وَعَنْ أَبِي ثَعْلَبَةَ الْخُشَنِيِّ ‏- رضى الله عنه ‏- قَالَ: { قُلْتُ: يَا رَسُولَ الْلَّهِ، إِنَّا بِأَرْضِ قَوْمٍ أَهْلِ كِتَابٍ، أَفَنَأْكُلُ فِي آنِيَتِهِمْ؟]فـَ] قَالَ: "لَا تَأْكُلُوا فِيهَا، إِلَّا أَنْ لَا تَجِدُوا غَيْرَهَا، فَاغْسِلُوهَا، وَكُلُوا فِيهَا" }  مُتَّفَقٌ عَلَيْهِ  1‏ .‏‏1 ‏- صحيح.‏ رواه البخاري (5478)‏ و (5488)‏، (5496)‏، ومسلم (1930)‏، وله طرق وألفاظ، عن أبي ثعلبة.‏