Rashi on Exodus 29:18/רש"י על שמות כ״ט:י״ח

1ריח נחוח AS A PLEASING ODOUR — as a gratification of spirit before Me — that I commanded and My will was carried out (Zevachim 46b).

2אשה AN OFFERING MADE BY FIRE a term connected with the word אש, fire: it denotes the burning of the parts which had been placed on the fire (cf. Rashi on Leviticus 1:9).