Rashi on Numbers 28:8/רש"י על במדבר כ״ח:ח׳

1ריח ניחח A SMELL OF ניחח — one that causes satisfaction (נחת רוח) to Me, that I gave commands and My will was executed (Sifrei Bamidbar 143:3; see Rashi on Leviticus 1:9).