It is narrated from Sayyiduna Jabir bin Abdullah (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings be upon him) ruled concerning pre-emption: "As long as it has not been divided and the boundaries have not been set."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الشفعة / 11558