Sunan Abi Dawud 4640
سنن أبي داود#4640Sahihحَدَّثَنَا مُوسَى بْنُ إِسْمَاعِيلَ، حَدَّثَنَا حَمَّادٌ، حَدَّثَنَا بُرْدٌ أَبُو الْعَلاَءِ، عَنْ مَكْحُولٍ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ " مَوْضِعُ فُسْطَاطِ الْمُسْلِمِينَ فِي الْمَلاَحِمِ أَرْضٌ يُقَالُ لَهَا الْغُوطَةُ " .
Makhul reported the Messenger of Allah (ﷺ) as saying:The place of the assembly of Muslims at the time of war will be in a land called al-Ghutah
Scholarly Authentication
The label above is the grade most of these scholars gave — one dissenting opinion no longer speaks for all of them. If any scholar calls a narration fabricated, that verdict is shown instead, whatever the others say. Each scholar's own wording:
Al-AlbaniSahih
Muhammad Muhyi Al-Din Abdul HamidSahih
Shuaib Al ArnautSahih Lighairihi
Zubair Ali ZaiSahih
In-book reference: 42:45