Musannaf Ibn Abi Shayba 1:823

Muhammad ibn Bishr al-‘Abdi narrated to us, he said: Mis‘ar narrated to us, from Bukayr ibn al-Akhnas, from Mus‘ab ibn Sa‘d, from Sa‘d, that he would sometimes become in a state of major ritual impurity (junub), then he would perform ablution (wudu), then he would go out.