Adam Clarke on Malachi 2:5

My covenant was with him of life and peace - These are the two grand blessings given to men by the New Covenant, which was shadowed by the Old. To man, excluded from the favor of God, and sentenced to death because of sin, God gave ברית berith, a covenant sacrifice, and this secured life - exemption from the death deserved by transgressors; communication of that inward spiritual life given by Christ, and issuing in that eternal life promised to all his faithful disciples. And, as it secured life, so it gave peace, prosperity, and happiness; peace between God and man, between man and man, and between man and his own conscience.