Rashi (citing the Sifra): To teach us that the ram of Asham Shifchah Charufah (like the Asham Me'ilos) must be worth two Shekalim (Sela'im). ¹

Targum Yonasan: To teach us that whoever is Chayav a Korban Asham is obligated to bring it as an Asham in the Name of Hashem (to atone) for the sin that he performed. ²

Moshav Zekenim (in Pasuk 6): To stress that, even though the Korban comes for a Safek, it is an Asham (a Korban for great guilt - it is an Asham to Hashem, who knows all hidden matters, and assuming he sinned, He would punish him (if he did not offer the Korban to shield him).

Rashi: To preclude the Asham Nazir and the Asham Metzora - which do not need to be worth two Shekalim. ¹

Seforno: To reassure the sinner, - who may otherwise think that, since he may not have sinned, his Korban is not valied and he brought Chulin into the Azarah - that his Korban is Kasher.

Seforno: It means that he is guilty of carelessness in allowing the Safek to occur.

Targum Yonasan: It implies that whatever one brings as an Asham, one should bring in the name of Hashem. ¹