Does the original seller's right of preemption lapse if he sells only a part of his share?
General Chapter
Al-Mughni
Book of Preemption (Shuf'ah)
Primary text
One opinion states that the seller's right of preemption lapses entirely if he sells a part of his share because preemption cannot be split (la tata'abbad), and the invalidation of a part causes the invalidation of the whole, analogously to divorce or waiving part of a preemption claim.
Supporting text
The alternative view asserts that the right does not lapse, as the remaining part of his ownership still grants him the entitlement to claim preemption over the entire property sold.