It is narrated from Sayyiduna Hudhayfah (may Allah be pleased with him) that he said: I was with the Messenger of Allah (peace and blessings be upon him). He came to the rubbish heap of some people, and he (peace and blessings be upon him) urinated standing. Then he performed ablution and wiped over his leather socks.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الطهارة / 1299