Sahih al-Bukhari 7240

Arabic

حَدَّثَنَا يَحْيَى بْنُ بُكَيْرٍ، حَدَّثَنَا اللَّيْثُ، عَنْ جَعْفَرِ بْنِ رَبِيعَةَ، عَنْ عَبْدِ الرَّحْمَنِ، سَمِعْتُ أَبَا هُرَيْرَةَ ـ رضى الله عنه ـ أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ ‏ "‏ لَوْلاَ أَنْ أَشُقَّ عَلَى أُمَّتِي لأَمَرْتُهُمْ بِالسِّوَاكِ ‏"‏‏.‏

English translation

Narrated Abu Huraira:Allah's Messenger (ﷺ) said, "Were I not afraid that it would be hard on my followers, I would order them to use the siwak (as obligatory, for cleaning the teeth)

Reference: Sahih al-Bukhari 7240, Book of Wishes. English translation by Dr. Muhammad Muhsin Khan.