the Messenger of Allah ﷺ ruled concerning preemption of land that has not been divided; if the boundaries have been set then there is no preemption. (Using translation from Ibn Mājah 2497)
عَنِ النَّبِيِّ ﷺ أَنَّهُ قَالَ الشُّفْعَةُ فِيمَا لَمْ يُقْسَمْ فَإِذَا وَقَعَتِ الْحُدُودُ فَلَا شُفْعَةَ