Sunan Abi Dawud — Tribute, Spoils, and Rulership (Kitab Al-Kharaj, Wal-Fai' Wal-Imarah) — Hadith No: 3072
Translation
Narrated Abdullah ibn Umar: The Prophet (ﷺ) gave az-Zubayr the land as a fief up to the reach of his horse when he runs. He, therefore, made his horse run until it stopped. He then threw his flog. Thereupon he said: Give him (the land) up to the point where his flog has reached