عَنْ بُرَيْدَةَ الْأَسْلَمِيِّ قَالَ سَمِعْتُ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ يَقُولُ ”سَتَكُونُ بَعْدِي بُعُوثٌ كَثِيرَةٌ فَكُونُوا فِي بَعْثِ خُرَاسَانَ ثُمَّ انْزِلُوا مَدِينَةَ مَرْوَ فَإِنَّهُ بَنَاهَا ذُو الْقَرْنَيْنِ وَدَعَا لَهَا بِالْبَرَكَةِ وَلَا يَضُرُّ أَهْلَهَا سُوءٌ“
It is narrated from Sayyiduna Buraidah Aslami, may Allah be pleased with him, that the Messenger of Allah, peace and blessings be upon him, said: After me, many armies will be dispatched; strive to be part of the army that goes towards Khurasan and reside in the city of Marw, for Dhu al-Qarnayn built this city and prayed for its blessing. No evil thing can harm the people of this place.