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.
bayhaqi:1203Abū ʿAbdullāh al-Ḥāfiẓ > Abū ʿAmr b. al-Sammāk > Ḥanbal b. Isḥāq > Qabīṣah > Sufyān > Ismāʿīl b. Abū Khālid > Qays > Jarīr

[Machine] He used to instruct his family to perform ablution, preferring the use of siwak.  

البيهقي:١٢٠٣أَخْبَرَنَا أَبُو عَبْدِ اللهِ الْحَافِظُ ثنا أَبُو عَمْرِو بْنُ السَّمَّاكِ ثنا حَنْبَلُ بْنُ إِسْحَاقَ ثنا قَبِيصَةُ ثنا سُفْيَانُ عَنْ إِسْمَاعِيلَ بْنِ أَبِي خَالِدٍ عَنْ قَيْسٍ عَنْ جَرِيرٍ

أَنَّهُ كَانَ يَأْمُرُ أَهْلَهُ يَتَوَضَّئُونَ بِفَضْلِ سِوَاكِهِ