Shabbos, 26b: To include a piece of cloth that is three by three fingerbreadths in the Din of Nig'ei Begadim. ¹

Sifra: To include a Beged of Sha'atnez in the Din of Nig'ei Begadim. ²

Sifra: To connect it with the previous Pasuk - to teach us that stricken Begadim must be sent out of the camp just like stricken people.

Sifra: To compare wool to linen which is normally not dyed), to confine the Din of Nig'ei Begadim to white woolen garments - and not to colored ones. ¹

Bechoros, 17a: To compare wool to linen, which is natural (unchanged) - to preclude the wool of a Nidmeh (a lamb whose mother is a goat) from the Din of Nig'ei Begadim.

Sifra #1 (according to R. Yehudah): To teach us that, like Beged, all the various items that are mentioned in the following Pasuk only become subject to Nig'ei Begaim after they are completed - 'Shesi' (of wool), after it has been boiled, 'Areiv' (of wool) immediately and pieces of flax, as soon as they have been bleached.

Sifra #2: To teach us that all the items are only subject to Nig'ei Begadim if they have been woven at least the Shi'ur of three by three fingerbreadths. ¹

Sifra #3: It precludes the strands that protrude from the Beged of each item from the Din of Nig'ei Begadim. ²

Hadar Zekenim in Pasuk 46 (citing the Bechor Shor): Because , since there is no such thing as a Metzora who does not need to Tovel his clothes, the Torah teaches the Taharah of Adam and of Begadim together.

Moshav Zekenim: It alludes to the Isur of wearing the boastful clothes of Nochrim, since their priests have a symbol of idolatry on their garments.