NET
15 For if their rejection is the reconciliation of the world, what will their acceptance be but life from the dead?
Darby
15 For if their casting away [be the] world's reconciliation, what [their] reception but life from among [the] dead?
KJV
15 For if the casting away of them [be] the reconciling of the world, what [shall] the receiving [of them be], but life from the dead?