Leviticus 1:9

עלה [AND THE PRIEST SHALL CAUSE ALL TO ASCEND IN FUMES ON THE ALTAR, TO BE] A BURNT OFFERING — i. e. only with the intention that it should be an עולה shall he burn it (and not that it should be an offering of another class. The words are to be translated: he shall burn it as an עולה) (Sifra, Vayikra Dibbura d'Nedavah, Chapter 6 10). אשה AS A FIRE OFFERING — When he slaughters it he shall slaughter it with the intention of making a fire of it (i. e. having in mind the fact that it is to become a prey to the flames, not that it will become charred flesh) (Sifra, Vayikra Dibbura d'Nedavah, Chapter 6 10). The word אשה wherever it occurs, is connected with אש, feuchère in O. F. ניחוח (of the root נוח, “to repose”, “to draw satisfaction from …”) — an odour of ניחוח: one that causes satisfaction to Me by the knowledge that I gave commands and that My will was executed (Sifra, Vayikra Dibbura d'Nedavah, Chapter 6 10; Zevachim 46b).

וְקִרְבּ֥וֹ וּכְרָעָ֖יו יִרְחַ֣ץ בַּמָּ֑יִם וְהִקְטִ֨יר הַכֹּהֵ֤ן אֶת־הַכֹּל֙ הַמִּזְבֵּ֔חָה עֹלָ֛ה אִשֵּׁ֥ה רֵֽיחַ־נִיח֖וֹחַ לַֽיהֹוָֽה׃ {ס}        

but its inwards and its legs shall he wash in water: and the priest shall burn all on the altar, to be a burnt sacrifice, an offering made by fire, of a sweet savour to the Lord.