Qays bin Asim (may Allah be pleased with him) came to the Prophet (peace and blessings be upon him) intending to accept Islam, and the Prophet (peace and blessings be upon him) ordered him "to take a ritual bath with water and lote-tree leaves." (b) Muhammad bin Kathir and a group narrated it with the same meaning; most of them say that it is narrated from his grandfather, Qays bin Asim (may Allah be pleased with him).
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الطهارة / 808