Abdul-Rahman bin Awf said, "The Messenger of Allah ﷺ and Umar bin Khattab granted me such-and-such land."So Zubayr went to the family of Umar and bought their share from them. Then he came to Uthman bin Affan and said, "Abdul-Rahman bin Awf claims that the Messenger of Allah ﷺ and Umar bin Khattab granted him such-and-such land, and I have bought the share of Umar's family."Uthman replied, "Abdul-Rahman's testimony is valid, both for him and against him."
حدثنا عفان حدثنا حماد بن سلمة حدثنا هشام بن عروة عن عروة أن
أقطعني رسول الله ﷺ وعمر بن الخطاب أرض كذا وكذا فذهب الزبير إلى آل عمر فاشترى نصيبه منهم فأتى عثمان بن عفان فقال إن عبد الرحمن بن عوف زعم أن رسول الله ﷺ أقطعه وعمر بن الخطاب أرض كذا وكذا وإني اشتريت نصيب آل عمر فقال عثمان عبد الرحمن جائز الشهادة له وعليه
No references are available.
Its isnad is sahih, except that I doubt whether Urwa bin Zubayr actually heard from Abdul-Rahman bin Awf. His age at the time of Abdul-Rahman's death was about nine years. I also could not find this hadith elsewhere.