In the Old Testament, the Israelites offered grain offerings as fragrant offerings to God. (Lev 2:1-2)
Lev 2:1 And when any will offer a meat offering unto the Lord, his offering shall be of fine flour; and he shall pour oil upon it, and put frankincense thereon: 2 And he shall bring it to Aaron's sons the priests: and he shall take thereout his handful of the flour thereof, and of the oil thereof, with all the frankincense thereof; and the priest shall burn the memorial of it upon the altar, to be an offering made by fire, of a sweet savour unto the Lord:
Jesus offered Himself to God for us as a fragrant sacrifice. (Eph 5:2)
Eph 5:2 And walk in love, as Christ also hath loved us, and hath given himself for us an offering and a sacrifice to God for a sweetsmelling savour.