The Cleansing of Impurities - Section 2 — Mishkat al-Masabih 501, 502

When al-Husain b. ‘Ali was sitting in God’s messenger’s lap he passed water and I said, “Put on a garment and give me your lower garment to wash;" but he replied, “It is only the urine of a female which should be washed; the urine of a male should be sprinkled." Ahmad, Abu Dawud and Ibn Majah transmitted it. In a version by Abu Dawud and Nasa’i from Abus Samh he said, "It should be washed because of a girl’s urine and sprinkled because of a boy’s."