NET

15 And so he is the mediator of a new covenant, so that those who are called may receive the eternal inheritance he has promised, since he died to set them free from the violations committed under the first covenant.

Darby

15 And for this reason he is mediator of a new covenant^D9092, so that, death having taken place for redemption of the transgressions under the first covenant, the called might receive the promise of the eternal inheritance.

Darby Bible Notes

covenant - The absence of the article makes it characteristic of him. he is 'new (kainos) covenant mediator.' see 2Cor. 3.6.

KJV

15 And for this cause he is the mediator of the new testament, that by means of death, for the redemption of the transgressions [that were] under the first testament, they which are called might receive the promise of eternal inheritance.

Strong's

15 And ^G2532 for this^G5124 cause^G1223 he is^G2076 the mediator^G3316 of the new^G2537 testament^G1242, that^G3704 by means^G1096 of death^G2288, for^G1519 the redemption^G629 of the transgressions^G3847 that were] were under^G1909 the first^G4413 testament^G1242, they which are called^G2564 might receive^G2983 the promise^G1860 of eternal^G166 inheritance^G2817.