He heard him say, while he was in Fustat during the caliphate of Muawiya, and Muawiya was the one who had sent people most often on military expeditions against Constantinople, "By Allah, this ummah will not fall short of half a day. When you see Sham as the dining table of one man and his household, at that point Constantinople will be conquered."
حدثنا هاشم قال حدثنا ليث عن معاوية بن صالح عن عبد الرحمن بن جبير عن أبيه قال سمعت
أنه سمعه يقول وهو بالفسطاط في خلافة معاوية وكان معاوية أغزى الناس القسطنطينية فقال والله لا تعجز هذه الأمة من نصف يوم إذا رأيت الشام مائدة رجل واحد وأهل بيته فعند ذلك فتح القسطنطينية
No references are available.
Its isnad is sahih, and the hadith was narrated by Abu Dawud, 4/125, no. 4349, in the Book of Malahim, chapter on the coming of the Hour. Hakim graded it sahih, 4/424, and Dhahabi agreed with him. It was attributed to all of them in Fath al-Bari, 11/351.