I came to the Prophet (may Allah’s peace and blessings be upon him) with the intention of embracing Islam. He commanded me to take a bath with water and the leaves of a lote tree

Qays ibn 'Āsim came to the Prophet (may Allah's peace and blessings be upon him) with the intention to embrace Islam. So, the Prophet (may Allah's peace and blessings be upon him) instructed him to bathe with water and lote tree leaves, which are used for cleaning and have a good scent.