(14) باب قَوْلِ النَّبِيِّ صلى الله عليه وسلم " لَتَتْبَعُنَّ سَنَنَ مَنْ كَانَ قَبْلَكُمْ "
Narrated Abu Huraira:
The Prophet (ﷺ) said, "The Hour will not be established till my followers copy the deeds of the previous nations and follow them very closely, span by span, and cubit by cubit (i.e., inch by inch)." It was said, "O Allah's Messenger (ﷺ)! Do you mean by those (nations) the Persians and the Byzantines?" The Prophet said, "Who can it be other than they?"
Reference: Sahih al-Bukhari 7319
In-book reference: Book 96, Hadith 49
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 9, Book 92, Hadith 421