כֹּה־אָמַר֮ אֲדֹנָ֣י יְהוִה֒ בָּֽרִאשׁוֹן֙ בְּאֶחָ֣ד לַחֹ֔דֶשׁ תִּקַּ֥ח פַּר־בֶּן־בָּקָ֖ר תָּמִ֑ים וְחִטֵּאתָ֖ אֶת־הַמִּקְדָּֽשׁ׃
Thus saith the Lord GOD: In the first month, in the first day of the month, thou shalt take a young bullock without blemish; and thou shalt purify the sanctuary.
Read midrashic interpretation of Ezekiel 45:18: and classical rabbinic exegesis.