Christians are the aroma of Christ when their faithful lives and witness spread the knowledge of Jesus, bringing life to believers and judgment to rejecters.
2 Corinthians 2:14-17: How are Christians “the aroma of Christ”?
Paul used the imagery of the triumphal procession illustratively, which was a reference to the Levitical sacrifices of the Old Testament when he wrote his second letter to Christians in Corinth in 55 C.E. While such (εὐωδία euōdia) “aroma” is likely repulsive to unrighteous individuals, it is a pleasant fragrance, pleasing aroma (2Co 2:15; Eph 5:2; Php 4:18), sweet-smelling to God and righteous hearted ones.

