Mishnah Negaim 14:4: Three people shave and their shaving is a commandment: The Nazirite, the leper, and Levites. All of them who shaved without a razor or who left two hairs have accomplished nothing.

שְׁלשָׁה מְגַלְּחִין וְתִגְלַחְתָּן מִצְוָה, הַנָּזִיר וְהַמְּצֹרָע וְהַלְוִיִּם. וְכֻלָּן שֶׁגִּלְּחוּ שֶׁלֹּא בְתַעַר אוֹ שֶׁשִּׁיְּרוּ שְׁתֵּי שְׂעָרוֹת, לֹא עָשׂוּ כְלוּם:

Mishnah Negaim 14:5: The two birds, their commandment is that they be similar in appearance, height and value, and should be bought at the same time. Even if they are not the same they are [still] valid. If he bought one today and one tomorrow they are valid. If he slaughtered one of them and found that it was not wild, he should bring a partner for the second one. The first one is permitted to be eaten. If he slaughtered it and found it to be a Terefah [an animal with a mortal condition such that it would die within one year], he should bring a partner for the second one. The first is permitted in benefit. If the blood spilled, the one to be sent away must die. If the one to be sent away dies, the blood must be spilled out.

שְׁתֵּי צִפֳּרִים מִצְוָתָן שֶׁיְּהוּ שָׁווֹת בַּמַּרְאֶה וּבַקּוֹמָה וּבַדָּמִים, וּלְקִיחָתָן כְּאֶחָת. אַף עַל פִּי שֶׁאֵינָם שָׁווֹת, כְּשֵׁרוֹת. לָקַח אַחַת הַיּוֹם וְאַחַת לְמָחָר, כְּשֵׁרוֹת. שָׁחַט אַחַת מֵהֶן וְנִמְצֵאת שֶׁלֹּא דְרוֹר, יִקַּח זוּג לַשְּׁנִיָּה. הָרִאשׁוֹנָה מֻתֶּרֶת בַּאֲכִילָה. שְׁחָטָהּ וְנִמְצֵאת טְרֵפָה, יִקַּח זוּג לַשְּׁנִיָּה. הָרִאשׁוֹנָה מֻתֶּרֶת בַּהֲנָאָה. נִשְׁפַּךְ הַדָּם, תָּמוּת הַמִּשְׁתַּלַּחַת. מֵתָה הַמִּשְׁתַּלַּחַת, יִשָּׁפֵךְ הַדָּם: