Umar bin Khattab reported,

He appointed a freedman of his named Hunay over the protected pasture and said to him, "Hunay, lower your wing to the people and beware of the prayer of one who has been wronged, for the prayer of the wronged is answered. Admit the owner of the small flock and the owner of the modest herd, but keep away from me the livestock of Ibn Awf and Ibn Affan, for if their livestock perish, they will fall back on their palm groves and crops, whereas if the small flock and modest herd of these poor men perish, their owner will come to me with his sons and say, 'Commander of the Faithful! Commander of the Faithful!' Am I then to abandon them? May you have no father! Providing water and pasture is easier for me than providing gold and silver. By Allah, they think I have wronged them. These are indeed their lands and their waters. They fought over them in the days of ignorance and embraced Islam upon them. By the One in whose hand my soul rests, were it not for the livestock I send out in the cause of Allah, I would not have set aside a single span of their land as protected pasture."

Azami 8148

Sahih

عن عمر بن الخطاب

أنه استعمل مولى له يدعى هنياعلى الحمى، فقال: يا هني، اضهم جناحك عن الناس، واتق دعوة المظلوم، فإن دعوة المظلوم مستجابة، وأدخل رب الصريمة ورب الغنيمة، وإياي ونعم ابن عوف ونعم ابن عفان، فأنهما إن تهلك ماشيتهما يرجعا إلى نخل وزرع، وإن رب الصريمة ورب الغنيمة إن تهلك ماشيتهما يأتني ببنيه، فيقول: يا أمير المؤمنين! يا أمير المؤمنين! أفتاركهم أنا؟ لا أبا لك، فالماء والكلة أيسر علي من الذهب والورق، وايم الله أنهم ليرون أني قد ظلمتهم، إنها لبلادهم ومياههم، قاتلوا عليها في الجاهلية، وأسلموا عليها في الإسلام، والذي نفسي بيده لولا المال الذي أحمل عليه في سبيل الله ما حميت عليهم من بلادهم شبرا.

الأعظمي 8148صحيح
Contents
Reference
Commentary
Ayat
Collection
Jami al-Kamil
Book
Rulings on the people of the covenant
Section
If a people accept Islam in the land of war and they have wealth and lands, these belong to them
Numbering
Jami al-Kamil 8148 (2nd edition)