Be heirs (klēronomoi). No predicate in the Greek (eisin). See note on Gal 4:1. If legalists are heirs of the Messianic promise to Abraham (condition of first class, assumed as true for argument’s sake), the faith is emptied of all meaning (kekenōtai, perfect passive indicative of kenoō) and the promise to Abraham is made permanently idle (katērgētai).