Musannaf Ibn Abi Shaybah 775 — A man performing his ghusl for janabah

Al-Zuhri said: Abu Salamah bin Abd al-Rahman used to keep relations with a slave-girl in secret from his wife, and he disliked that his household should come to know of it. So he would wash his body up to his throat and would not wash his head, lest they come to know of it from his wet hair. Then he would come to his family and say: "I have a pain in my head," and he would call for khatmi (a cleansing herb) and wash his head with it.