Leviticus 14:6

את הצפור החיה יקח אתה AS FOR THE LIVING BIRD HE SHALL‎ TAKE IT — The phrasing (since it does not state ‘‘the living bird and the cedar wood etc. he shall take”, but, “the living bird, he shall take it, and the cedar stick etc.”) informs us that he does not bind it (the bird) together with them (the cedar wood etc.) but keeps it apart by itself. The cedar stick, however, and the hyssop are tied together by the crimson slip, just as it is stated: “and the cedar wood and the crimson slip and the hyssop” — one “taking” for the three (since these three are grouped together after the word יקח). One might think that just as it (the bird) does not come under the regulation as regards binding, so, too, it does not come under the regulation as regards “dipping”; it therefore states “and he shall dip them and the living bird” — thus it (Scripture) mentions the bird again in connection with them to bring it, too, under the regulation of dipping (cf. Sifra, Metzora, Chapter 1 6).

as for the living bird, he shall take it, and the cedar wood, and the scarlet, and the hyssop, and shall dip them and the living bird in the blood of the bird that was killed over the running water:

אֶת־הַצִּפֹּ֤ר הַֽחַיָּה֙ יִקַּ֣ח אֹתָ֔הּ וְאֶת־עֵ֥ץ הָאֶ֛רֶז וְאֶת־שְׁנִ֥י הַתּוֹלַ֖עַת וְאֶת־הָאֵזֹ֑ב וְטָבַ֨ל אוֹתָ֜ם וְאֵ֣ת ׀ הַצִּפֹּ֣ר הַֽחַיָּ֗ה בְּדַם֙ הַצִּפֹּ֣ר הַשְּׁחֻטָ֔ה עַ֖ל הַמַּ֥יִם הַֽחַיִּֽים׃