سُنَنُ النَّسَائِيِّ
Sunan an-Nasa’i 188
The Book of Purification
Mentioning When Ghusl (A Purifying Bath) Is Obligatory And When It Is Not - The Ghusl Of The Disbeliever when He Accepts Islam
أَخْبَرَنَا عَمْرُو بْنُ عَلِيٍّ، قَالَ حَدَّثَنَا يَحْيَى، قَالَ حَدَّثَنَا سُفْيَانُ، عَنِ الأَغَرِّ، - وَهُوَ ابْنُ الصَّبَّاحِ - عَنْ خَلِيفَةَ بْنِ حُصَيْنٍ، عَنْ قَيْسِ بْنِ عَاصِمٍ، أَنَّهُ أَسْلَمَ فَأَمَرَهُ النَّبِيُّ صلى الله عليه وسلم أَنْ يَغْتَسِلَ بِمَاءٍ وَسِدْرٍ .
It was narrated from Qais bin 'Asim that he accepted Islam, and the Prophet (ﷺ) commanded him to perform Ghusl with water and lotus leaves.
Sunan an-Nasa'i, 188Sahih (Darussalam)