Bill Mounce

For an Informed Love of God

ἑαυτοῦ

ἑαυτοῦ means “himself/herself/itself”

“Do not be anxious about tomorrow, for tomorrow will be anxious about ἑαυτοῦ” (Matt 6:34).

Mounce's Expository Dictionary (abridged): 

Pronoun: ἑαυτοῦ (heautou), GK G1571 (S G1438), 319x). ἑαυτοῦ is the reflexive pronoun, “himself, herself, itself” (Mt. 8:22; 12:26; 9:21). It is also used for the first and second persons (Rom. 8:23; Mt. 23:31) and can be equivalent to ἀλλήλων (Mk. 10:26; Jn. 12:19; ἀφ’ ἑαυτοῦ, ἀφ’ ἑαυτῶν, of himself, themselves”).