Musnad Ahmad 1312:1

Abu Bakr al-Hanafi narrated to us, he said: Usamah ibn Zayd narrated to us, from ‘Amr ibn Shu‘ayb, from Umm Kurz al-Khuza‘iyyah, she said: A boy was brought to the Prophet, may Allah bless him and grant him peace, and he urinated on him, so he ordered it to be sprinkled with water. Then a girl was brought, and she urinated on him, so he ordered it to be washed.