ENOfficial
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.
Source: sunnah.com
Other translations
Arabic
حَدَّثَنَا أَحْمَدُ بْنُ حَنْبَلٍ، حَدَّثَنَا حَمَّادُ بْنُ خَالِدٍ، عَنْ عَبْدِ اللَّهِ بْنِ عُمَرَ، عَنْ نَافِعٍ، عَنِ ابْنِ عُمَرَ، أَنَّ النَّبِيَّ صلى الله عليه وسلم أَقْطَعَ الزُّبَيْرَ حُضْرَ فَرَسِهِ فَأَجْرَى فَرَسَهُ حَتَّى قَامَ ثُمَّ رَمَى بِسَوْطِهِ فَقَالَ " أَعْطُوهُ مِنْ حَيْثُ بَلَغَ السَّوْطُ " .
sunnah.com