It is reported from Sayyiduna Ibn Umar (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings be upon him) granted Sayyiduna al-Zubayr (may Allah be pleased with him) land by the running of his horse. So he ran the horse until it stopped, then threw his whip. He (peace and blessings be upon him) said: "Give him land as far as the whip has reached."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب إحياء الموات / 11790