Sayyiduna Qays bin Asim (may Allah be pleased with him) came to the Prophet (peace and blessings be upon him), and the Prophet (peace and blessings be upon him) ordered him to take a ritual bath (ghusl) with water and lote-tree leaves.
Hadith Referenceالمعجم الكبير للطبراني / باب القاف / 15957