Musannaf Ibn Abi Shaybah 35233 — What they said on a man who does

Khalid bin Abi Imran (may Allah have mercy on him) said: I asked al-Qasim bin Muhammad (may Allah have mercy on him) and Salim bin Abdullah, both of them: "A man among us is in enemy territory, and he catches fish and sells them, and then many dirhams accumulate with him. What is the ruling on them?" He (may Allah have mercy on him) said: "There is no harm in that."