Hadith 159

He also reported God’s messenger as saying, “Islam began as a small religion and will return to the state in which it began. Then blessed will be the few [who hold to it]' Muslim transmitted it.

وَعَنْ أَبِي هُرَيْرَةَ رَضِيَ اللَّهُ عَنْهُ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «بَدَأَ الْإِسْلَامُ غَرِيبًا وَسَيَعُودُ كَمَا بَدَأَ فَطُوبَى للغرباء» . رَوَاهُ مُسلم

Reference: 5601590
In-book reference: Book 1, Hadith 159