NRS 133.140: Agreements of testator.

A bond, covenant or agreement made by a testator to convey any property devised in any will previously made is not a revocation of the previous devise, but the property passes by the devise, subject to the same remedies on the bond, covenant or agreement, for the specific performance or otherwise, against the devisee, as might be had by law against the heirs of the testator, if the property had descended to them.