Narrated Abu Sa'id Al-Khudri:

The Prophet ﷺ said, "You will follow the ways of those nations who were before you, span by span and cubit by cubit (i.e., inch by inch) so much so that even if they entered a hole of a mastigure, you would follow them." We said, "O Allah's Apostle! (Do you mean) the Jews and the Christians?" He said, "Whom else?"

حَدَّثَنَا مُحَمَّدُ بْنُ عَبْدِ الْعَزِيزِ، حَدَّثَنَا أَبُو عُمَرَ الصَّنْعَانِيُّ ـ مِنَ الْيَمَنِ ـ عَنْ زَيْدِ بْنِ أَسْلَمَ، عَنْ عَطَاءِ بْنِ يَسَارٍ، عَنْ أَبِي سَعِيدٍ الْخُدْرِيِّ، عَنِ النَّبِيِّ ﷺ قَالَ " لَتَتْبَعُنَّ سَنَنَ مَنْ كَانَ قَبْلَكُمْ شِبْرًا شِبْرًا وَذِرَاعًا بِذِرَاعٍ، حَتَّى لَوْ دَخَلُوا جُحْرَ ضَبٍّ تَبِعْتُمُوهُمْ ". قُلْنَا يَا رَسُولَ اللَّهِ الْيَهُودُ وَالنَّصَارَى قَالَ " فَمَنْ ".