It is narrated from Sayyiduna Abu Hurayrah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) "ruled for pre-emption in whatever has not been divided. When boundaries have been set, the right of pre-emption no longer remains."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الشفعة / 11564