A man from the tribe of Juhaynah relates that the Messenger of Allah (peace and blessings be upon him) said: "You will fight a people and gain the upper hand over them. They will make peace with you by giving you wealth, keeping their own lives and children apart. Do not take anything from them beyond that, for it is not lawful for you."
The man from Thaqif said: I accompanied al-Juhani on a military expedition or a journey, and he was among the most restrained of people towards (the property of) the enemy.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الجزية / 18729