Sulayman ibn Yasar سليمان بن يسار مولى ميمونة بنت الحارث · The Chapters on Jihad

“I saw a man asking my father about a man who goes out to fight and buys and sells and trades during his campaign. My father said to him: ‘We were with the Messenger of Allah (ﷺ) in Tabuk, and we bought and sold, and he saw us and did not forbid us (to do that).’”