Musannaf Ibn Abi Shaybah

Hazrat Umar bin Zurais Asadi (may Allah have mercy on him) says that I asked Hazrat Sha’bi (may Allah have mercy on him): We are going for jihad in Armenia, which is a region of the Christians. What is your opinion regarding their slaughtered animals and their food? He (may Allah have mercy on him) replied: When we used to do jihad in any place, we would inquire about the people there. If they said: We are Jews or Christians, then we would eat their slaughtered animals and their food, and we would cook in their utensils.