Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
ahmad:21960 – Yaʿqūb from my father > Ibn Isḥāq > Muḥammad b. Yaḥyá b. Ḥabbān al-Anṣārī Thum al-Māzinī Māzin Banī al-Najjār > ʿUbaydullāh b. ʿAbdullāh b. ʿUmar

[Machine] "The Messenger of Allah ﷺ was commanded to perform ablution before every prayer, whether he was in a state of ritual purity or not. When this became burdensome for the Messenger of Allah ﷺ, he was then commanded to use a toothbrush (siwak) before every prayer, and ablution was no longer required for him except in cases of ritual impurity."  

أحمد:٢١٩٦٠ – حَدَّثَنَا يَعْقُوبُ حَدَّثَنَا أَبِي عَنِ ابْنِ إِسْحَاقَ حَدَّثَنِي مُحَمَّدُ بْنُ يَحْيَى بْنِ حَبَّانَ الْأَنْصَارِيُّ ثُمَّ الْمَازِنِيُّ مَازِنُ بَنِي النَّجَّارِ عَنْ عُبَيْدِ اللهِ بْنِ عَبْدِ اللهِ بْنِ عُمَرَ قَالَ قُلْتُ لَهُ أَرَأَيْتَ وُضُوءَ عَبْدِ اللهِ بْنِ عُمَرَ لِكُلِّ صَلَاةٍ طَاهِرًا كَانَ أَوْ غَيْرَ طَاهِرٍ عَمَّ هُوَ؟ فَقَالَ حَدَّثَتْهُ أَسْمَاءُ بِنْتُ زَيْدِ بْنِ الْخَطَّابِ أَنَّ عَبْدَ اللهِ بْنَ حَنْظَلَةَ بْنِ أَبِي عَامِرِ الْغَسِيلِ حَدَّثَهَا

أَنَّ رَسُولَ اللهِ ﷺ كَانَ أُمِرَ بِالْوُضُوءِ لِكُلِّ صَلَاةٍ طَاهِرًا كَانَ أَوْ غَيْرَ طَاهِرٍ فَلَمَّا شَقَّ ذَلِكَ عَلَى رَسُولِ اللهِ ﷺ أُمِرَ بِالسِّوَاكِ عِنْدَ كُلِّ صَلَاةٍ وَوُضِعَ عَنْهُ الْوُضُوءُ إِلَّا مِنْ حَدَثٍ  

See similar narrations below:

Collected by Dārimī
darimi:684 – Aḥmad b. Khālid > Muḥammad > Ibn Isḥāq > Muḥammad b. Yaḥyá b. Ḥabbān > ʿAbdullāh b. ʿAbdullāh b. ʿUmar > Qult Araʾayt Tawaḍḍuʾ Ibn ʿUmar Likul Ṣalāh Ṭāhir or Ghayr Ṭāhir ʿAm Dhalik > Asmāʾ b. Zayd b. al-Khaṭṭāb > ʿAbdullāh b. Ḥanẓalah b. Abū ʿĀmir Ḥaddathahā

[Machine] The messenger of Allah ﷺ was commanded to perform wudu (ablution) for every prayer, whether in a state of purity or impurity, and when this became burdensome for him, he was commanded to use the siwak (toothstick) for every prayer. Ibn Umar believed that it gave him strength, so he would not leave performing wudu for every prayer.  

الدارمي:٦٨٤ – أَخْبَرَنَا أَحْمَدُ بْنُ خَالِدٍ حَدَّثَنَا مُحَمَّدٌ هُوَ ابْنُ إِسْحَاقَ عَنْ مُحَمَّدِ بْنِ يَحْيَى بْنِ حَبَّانَ عَنْ عَبْدِ اللَّهِ بْنِ عَبْدِ اللَّهِ بْنِ عُمَرَ قَالَ قُلْتُ أَرَأَيْتَ تَوَضُّأَ ابْنِ عُمَرَ لِكُلِّ صَلَاةٍ طَاهِرًا أَوْ غَيْرَ طَاهِرٍ عَمَّ ذَلِكَ؟ قَالَ حَدَّثَتْهُ أَسْمَاءُ بِنْتُ زَيْدِ بْنِ الْخَطَّابِ أَنَّ عَبْدَ اللَّهِ بْنَ حَنْظَلَةَ بْنِ أَبِي عَامِرٍ حَدَّثَهَا

أَنَّ رَسُولَ اللَّهِ ﷺ «أُمِرَ بِالْوُضُوءِ لِكُلِّ صَلَاةٍ طَاهِرًا أَوْ غَيْرَ طَاهِرٍ فَلَمَّا شَقَّ ذَلِكَ عَلَيْهِ أُمِرَ بِالسِّوَاكِ لِكُلِّ صَلَاةٍ» وَكَانَ ابْنُ عُمَرَ يَرَى أَنَّ بِهِ عَلَى ذَلِكَ قُوَّةً فَكَانَ لَا يَدَعُ الْوُضُوءَ لِكُلِّ صَلَاةٍ