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.
ahmad:2573Ibn Mahdī > Sufyān > Abū Isḥāq > al-Tamīmī > Ibn ʿAbbās Fadhakar Shayʾ

[Machine] And the Messenger of Allah ﷺ used to frequently use the Siwak. He said, "Until we thought or saw that it would be revealed to him."  

أحمد:٢٥٧٣حَدَّثَنَا ابْنُ مَهْدِيٍّ عَنْ سُفْيَانَ عَنْ أَبِي إِسْحَاقَ عَنِ التَّمِيمِيِّ عَنِ ابْنِ عَبَّاسٍ فَذَكَرَ شَيْئًا قَالَ

وَكَانَ رَسُولُ اللهِ ﷺ يُكْثِرُ السِّوَاكَ قَالَ حَتَّى ظَنَنَّا أَوْ رَأَيْنَا أَنَّهُ سَيُنْزَلُ عَلَيْهِ