The second is a disposition for consideration that transfers ownership, namely a sale. He may therefore take it by pre-emption on the basis of either sale.
The third is a disposition for consideration that does not transfer ownership, namely a pledge or lease. The author holds that a pledge or lease causes the right of pre-emption to lapse, but the correct view is that neither causes it to lapse, and that the co-owner may take the share.
His statement, “The revenue belongs to the purchaser,” means that the revenue belongs to the purchaser of the share.
For example, two men jointly own an apartment building and lease it for one year at one hundred thousand. One of the co-owners then sells his share to someone, but the other co-owner remains unaware of the sale until four months have passed. The revenue for those four months belongs to the purchaser. The reason is that it is an increase generated by his property. The Prophet ﷺ said: “Liability entails entitlement to revenue.” (1) It is his property, for which he bears liability; therefore, its revenue belongs to him.
His statement, “and any separable increase”: he is likewise entitled to any separable increase. For example, a man sells his share of a date-palm grove before it bears fruit, and the co-owner does not assert his right until after the fruit has appeared and been harvested. The increase has then become separate, so it belongs to the purchaser, because it is an increase generated by his property.
His statement, “and the crop”: if the co-owner sells his share to someone,