Midrash for Leviticus 4:31
וְאֶת־כָּל־חֶלְבָּ֣הּ יָסִ֗יר כַּאֲשֶׁ֨ר הוּסַ֣ר חֵלֶב֮ מֵעַ֣ל זֶ֣בַח הַשְּׁלָמִים֒ וְהִקְטִ֤יר הַכֹּהֵן֙ הַמִּזְבֵּ֔חָה לְרֵ֥יחַ נִיחֹ֖חַ לַיהוָ֑ה וְכִפֶּ֥ר עָלָ֛יו הַכֹּהֵ֖ן וְנִסְלַ֥ח לֽוֹ׃ (פ)
And all the fat thereof shall he take away, as the fat is taken away from off the sacrifice of peace-offerings; and the priest shall make it smoke upon the altar for a sweet savour unto the LORD; and the priest shall make atonement for him, and he shall be forgiven.
Sifra
5) (Vayikra 4:35): "And he shall atone for him," (Vayikra 4:31): "And he shall atone for him," (Vayikra 4:26): "And he shall atone for him." What is the intent of this? (i.e., Why three times?) It is needed. For it might be reasoned: Blood is mentioned (as being applied) below (the red line on the altar [i.e., the blood of burnt-offerings, etc.]), and blood is mentioned (as being applied) above the red line (i.e., the blood of sin-offerings, applied on the four horns). Just as with the blood applied below, one application atones, so, with the blood applied above, one application (on one horn) atones.
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