عَنْ أَبِي هُرَيْرَةَ ‏- رضى الله عنه ‏- عَنْ رَسُولِ اَللَّهِ ‏- صلى الله عليه وسلم ‏-قَالَ: { لَوْلَا أَنْ أَشُقَّ عَلَى أُمَّتِي لَأَمَرْتُهُمْ بِالسِّوَاكِ مَعَ كُلِّ وُضُوءٍ } أَخْرَجَهُ مَالِكٌ, وأَحْمَدُ, وَالنَّسَائِيُّ, وَصَحَّحَهُ اِبْنُ خُزَيْمَة َ 1‏ .‏‏1 ‏- صحيح.‏ علقه البخاري (458/فتح)‏ بصيغة الجزم، وعنده لفظ "عند" بدل "مع".‏ ورواه أحمد (2 /460 و 517)‏، والنسائي في "الكبرى" (298)‏، وابن خزيمة (140)‏.‏ وللحديث ألفاظ وطرق أخرى في "الصحيحين" وغيرهما، وقد ذكرتها "بالأصل".‏
Translation
Narrated Abu Huraira (rad)

Allah’s Messenger (ﷺ) said “Had I not feared burdening my Ummah, I would have commanded them to use Siwak with every ablution.” [Reported by Malik, Ahmad and An-Nasai. Ibn Khuzaima graded it Sahih (sound) and Al-Bukhari mentioned as a Mu’allaq (suspended – without its chain of narrators).

Comment

The Excellence of Siwak in Purification

This noble hadith from the Book of Purification in Bulugh al-Maram (Hadith 32) demonstrates the profound concern of the Prophet Muhammad (ﷺ) for his Ummah's ease while emphasizing the superior merit of using Siwak. The Messenger of Allah, in his infinite wisdom, refrained from making it obligatory solely to prevent hardship upon the believers, yet his statement serves as a powerful recommendation for this blessed practice.

Scholarly Commentary on the Hadith

The scholars of Islam have unanimously agreed upon the high recommendation (mustahabb) of using Siwak, particularly during ablution. Imam An-Nawawi commented that this hadith establishes the strong desirability of Siwak at the times of prayer and purification. The Siwak cleanses the mouth, pleases the Lord, and follows the Sunnah of the Chosen Prophet (ﷺ).

The phrase "with every ablution" indicates the importance of oral hygiene in the Islamic concept of purification. The scholars have derived from this that Siwak is especially recommended when performing wudu, when the mouth's smell changes, upon waking, before prayer, and when reciting the Qur'an. This practice combines both spiritual purification and physical cleanliness.

Legal Ruling and Practical Application

Although the Prophet (ﷺ) did not mandate Siwak as an obligation (wajib), its status as a highly emphasized Sunnah (Sunnah mu'akkadah) is established through this and other authentic narrations. The four schools of jurisprudence all regard Siwak as a recommended act with great reward.

The wisdom behind not making it obligatory reflects the mercy of Islamic legislation, which considers the capabilities and circumstances of all believers. Nevertheless, the conscientious Muslim should strive to implement this practice regularly to attain the pleasure of Allah and follow the complete guidance of the Prophet (ﷺ).