Siwak and Wudu

حَدَّثَنَا عَبْدُ اللَّهِ بْنُ يُوسُفَ، قَالَ أَخْبَرَنَا مَالِكٌ، عَنْ أَبِي الزِّنَادِ، عَنِ الأَعْرَجِ، عَنْ أَبِي هُرَيْرَةَ ـ رضى الله عنه ـ أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ ‏ "‏ لَوْلاَ أَنْ أَشُقَّ عَلَى أُمَّتِي ـ أَوْ عَلَى النَّاسِ ـ لأَمَرْتُهُمْ بِالسِّوَاكِ مَعَ كُلِّ صَلاَةٍ ‏"‏‏.‏

Narrated Abu Huraira: Allah's Messenger (ﷺ) said, "If I had not found it hard for my followers or the people, I would have ordered them to clean their teeth with Siwak for every prayer."

Sahih al-Bukhari 887 https://sunnah.com/bukhari:887

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وَيُذْكَرُ عَنْ عَامِرِ بْنِ رَبِيعَةَ قَالَ رَأَيْتُ النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ يَسْتَاكُ، وَهُوَ صَائِمٌ مَا لاَ أُحْصِي أَوْ أَعُدُّ. وَقَالَ أَبُو هُرَيْرَةَ عَنِ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «لَوْلاَ أَنْ أَشُقَّ عَلَى أُمَّتِي لأَمَرْتُهُمْ بِالسِّوَاكِ عِنْدَ كُلِّ وُضُوءٍ». وَيُرْوَى نَحْوُهُ عَنْ جَابِرٍ وَزَيْدِ بْنِ خَالِدٍ عَنِ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ، وَلَمْ يَخُصَّ الصَّائِمَ مِنْ غَيْرِهِ. وَقَالَتْ عَائِشَةُ عَنِ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «مَطْهَرَةٌ لِلْفَمِ، مَرْضَاةٌ لِلرَّبِّ». وَقَالَ عَطَاءٌ وَقَتَادَةُ يَبْتَلِعُ رِيقَهُ.

Narrated 'Amir bin Rabi`a, "I saw the Prophet cleaning his teeth with Siwak while he was fasting so many times as I can't count." And narrated Abu Huraira, "The Prophet said, 'But for my fear that it would be hard for my followers, I would have ordered them to clean their teeth with Siwak on every performance of ablution." The same is narrated by Jabir and Zaid bin Khalid from the Prophet who did not differentiate between a fasting and a nonfasting person in this respect (using Siwak). Aisha said, "The Prophet said, "It (i.e. Siwak) is a purification for the mouth and it is a way of seeking Allah's pleasures." Ata' and Qatada said, "There is no harm in swallowing the resultant saliva."

Sahih al-Bukhari Book 30 (27) Siwak for the person observing Saum (fast)

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حَدَّثَنَا قُتَيْبَةُ بْنُ سَعِيدٍ، وَعَمْرٌو النَّاقِدُ، وَزُهَيْرُ بْنُ حَرْبٍ، قَالُوا حَدَّثَنَا سُفْيَانُ، عَنْ أَبِي الزِّنَادِ، عَنِ الأَعْرَجِ، عَنْ أَبِي هُرَيْرَةَ، عَنِ النَّبِيِّ صلى الله عليه وسلم قَالَ ‏ "‏ لَوْلاَ أَنْ أَشُقَّ عَلَى الْمُؤْمِنِينَ - وَفِي حَدِيثِ زُهَيْرٍ عَلَى أُمَّتِي - لأَمَرْتُهُمْ بِالسِّوَاكِ عِنْدَ كُلِّ صَلاَةٍ ‏"‏ ‏.‏

Abu Huraira reported: The Apostle (ﷺ) said: Were it not that I might over-burden the believers-and in the hadith transmitted by Zuhair" people" -I would have ordered them to use toothstick at every time of prayer.

Sahih Muslim 252 https://sunnah.com/muslim:252