Bill Mounce

For an Informed Love of God

αὐτός

αὐτός means “he, she, it (they, them).”

“αὐτός will baptize you with the Holy Spirit and with fire” (Matt 3:11).

Mounce's Expository Dictionary (abridged): 

Pronoun: αὐτός (autos), GK 899 (S G846, G847, G848), 5,597x. αὐτός is generally used as the third person pronoun (“he, she, it”), but also as the identical (“same”) and intensive (e.g., Jesus “himself”) pronouns.