כֹּה־אָמַר֮ אֲדֹנָ֣י יְהוִה֒ בָּֽרִאשׁוֹן֙ בְּאֶחָ֣ד לַחֹ֔דֶשׁ תִּקַּ֥ח פַּר־בֶּן־בָּקָ֖ר תָּמִ֑ים וְחִטֵּאתָ֖ אֶת־הַמִּקְדָּֽשׁ׃
나 여호와가 말하노라 정월 초하룻날에 흠없는 수송아지 하나를 취하여 성소를 정결케 하되
Tze'enah Ure'enah
“Thus says the Lord” [45:18]. Thus says God, on the first of Nisan the priest should take an ox that has no blemish and you should purify the Temple with it.
Rashi
So says the Lord God: In the first month, on the first of the month, you shall take a young bull [and] without blemish This is the bull of investiture mentioned at the beginning of this section (43:18 27), and he teaches [us] here that the investiture should be on the first of Nissan.