وَعَن قيس بن عَاصِم: أَنَّهُ أَسْلَمَ فَأَمَرَهُ النَّبِيُّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ أَنْ يَغْتَسِلَ بِمَاءٍ وَسِدْرٍ. رَوَاهُ التِّرْمِذِيُّ وَأَبُو دَاوُدَ وَالنَّسَائِيُّ
Translation

Qais b. ‘Asim said that when he accepted Islam the Prophet commanded him to bathe with water and lote-tree leaves. Tirmidhi, Abu Dawud and Nasa’i transmitted it.