Abdullah bin Umar reported,
Umar acquired a piece of land at Khaybar, so he came to the Prophet ﷺ to consult him about it.He said, "Messenger of Allah, I have acquired a piece of land at Khaybar, and I have never obtained any property more precious to me than it. What do you command me to do with it?"The Prophet ﷺ replied, "If you wish, you may preserve its principal and give its produce as charity."So Umar gave it as charity, stipulating that its principal would not be sold, bought, inherited, or given away. Umar gave its produce as charity to the poor, to relatives, for freeing slaves, in the way of Allah, to the wayfarer, and to guests. There is no blame on whoever administers it if he eats from it in a reasonable manner or feeds a friend, without accumulating wealth from it.The narrator said, I related this to Ibn Sirin, and he said, "Without amassing property from it."
Azami 6117
Sahihعن ابن عمر قال
أصاب عمر أرضا بخيبر، فأتى النبي ﷺ يستأمره فيها، فقال: يا رسول الله، إني أصبت أرضا بخيبر، لم أصب مالا قط هو أنفس عندي منه، فما تأمرنى به؟ قال: إن شئت حبست أصلها، وتصدقت بها. قال: فتصدق بها عمر أنه لا يباع أصلها، ولا يبتاع، ولا يورث، ولا يوهب. قال: فتصدق عمر في الفقراء، وفى القربي، وفي الرقاب، وفي سبيل الله، وابن السبيل، والضيف. لا جناح على من وليها أن يأكل منها بالمعروف، أو يطعم صديقا غير متمول فيه. قال فحدثت به ابن سيرين، فقال: غير متأثل مالا.
Bukhari narrated it in the Book of Conditions (2737) and Muslim in the Book of Bequests (1632), both from the hadith of Ibn Awn, from Nafi, from Ibn Umar, who mentioned it. Ibn Awn said, Someone who read this document informed me that it contained, "not accumulating wealth." His statement, "not accumulating," means not amassing. Anything that has an old foundation, or that has been accumulated until it acquires a foundation, is called muathal, from which comes the phrase "established glory," meaning ancient.The following benefits may be drawn from this hadith:1. It demonstrates the virtue of Umar bin Khattab 
.2. It shows the practice of consulting people of knowledge and righteousness in matters of good.3. It shows that Khaybar was conquered by force, and those who won the spoils owned it, and their ownership of it became established in their hands.4. It shows the merit of maintaining family ties through endowment.5. It shows the permissibility of endowment, which is an Islamic term that was not known in the pre-Islamic era.6. Endowment does not require a judge's ruling, because the Prophet ﷺ did not command Umar to do that but only indicated it to him.7. An endowment cannot be sold, given away, or inherited, as stated in Umar's own words. This also shows that the one making the endowment may stipulate whatever conditions he wishes, and his conditions are valid.8. It shows the merit of endowment, which is ongoing charity.9. It is not permissible for the one making the endowment to retract it, just as one cannot retract a gift given to the poor and needy.10. Livestock such as camels, cattle, and sheep may be treated the same as real estate with regard to endowment, and they may be given as a gift for the sake of nearness to Allah for various purposes.11. There is no blame on whoever administers the endowment if he eats from it in a reasonable manner, that is, to the extent that meets his need and curbs his desire, along with wages for his work.12. Real estate may be treated the same as gardens and orchards, so the worker on it receives a fixed wage, monthly or yearly, which he draws from the produce, and then the remainder is distributed among those for whom the endowment was made, such as relatives, scholars, students of knowledge, and others, according to the conditions set by the one who made the endowment.