Musannaf Ibn Abi Shaybah 1300 — The urine of a small boy getting

Sayyiduna Abu Layla (may Allah be pleased with him) said: Once we were sitting with the Prophet (peace and blessings be upon him) when Sayyiduna al-Husayn bin Ali (may Allah be pleased with him) came crawling on his knees, climbed onto the blessed chest of the Prophet (peace and blessings be upon him) and urinated. We hurried forward to take hold of him, but the Prophet (peace and blessings be upon him) said: "My son, my son." Then he called for water and poured it over it.