Musannaf Ibn Abi Shayba 1:1193

Abu Bakr narrated to us, he said: Waki’ narrated to us, from Sufyan, from Alqamah ibn Marthad, from Sulayman ibn Buraydah, from Imran ibn Husayn, who said: "Whoever urinates in his place of bathing, then he has not purified himself."