5:1,2 Because God, for Christ's sake, has forgiven you, therefore be ye followers of God, imitators of God. Resemble him especially in his love and pardoning goodness, as becomes those beloved by their heavenly Father. In Christ's sacrifice his love triumphs, and we are to consider it fully.
2. And—in proof that you are so.
walk in love—resuming Eph 4:1, "walk worthy of the vocation."
as Christ … loved us—From the love of the Father he passes to the love of the Son, in whom God most endearingly manifests His love to us.
given himself for us—Greek, "given Himself up (namely, to death, Ga 2:20) for us," that is, in our behalf: not here vicarious substitution, though that is indirectly implied, "in our stead." The offerer, and the offering that He offered, were one and the same (Joh 15:13; Ro 5:8).
offering and a sacrifice—"Offering" expresses generally His presenting Himself to the Father, as the Representative undertaking the cause of the whole of our lost race (Ps 40:6-8), including His life of obedience; though not excluding His offering of His body for us (Heb 10:10). It is usually an unbloody offering, in the more limited sense. "Sacrifice" refers to His death for us exclusively. Christ is here, in reference to Ps 40:6 (quoted again in Heb 10:5), represented as the antitype of all the offerings of the law, whether the unbloody or bloody, eucharistical or propitiatory.
for a sweet-smelling savour—Greek, "for an odor of a sweet smell," that is, God is well pleased with the offering on the ground of its sweetness,and so is reconciled to us (Eph 1:6; Mt 3:17; 2Co 5:18, 19; Heb 10:6-17). The ointment compounded of principal spices, poured upon Aaron's head, answers to the variety of the graces by which He was enabled to "offer Himself a sacrifice for a sweet-smelling savor." Another type, or prophecy by figure, was "the sweet savor" ("savor of rest," Margin) which God smelled in Noah's sacrifice (Ge 8:21). Again, as what Christ is, believers also are (1Jo 4:17), and ministers are: Paul says (2Co 2:17) "we are unto God a sweet savor of Christ."