Mishkat al-Masabih #502
Purification
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَعَن قيس بن عَاصِم: أَنَّهُ أَسْلَمَ فَأَمَرَهُ النَّبِيُّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ أَنْ يَغْتَسِلَ بِمَاءٍ وَسِدْرٍ. رَوَاهُ التِّرْمِذِيُّ وَأَبُو دَاوُدَ وَالنَّسَائِيُّ
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.
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About Mishkat al-Masabih
This hadith is #502 from Mishkat al-Masabih, in the Book of Purification.