John Chrysostom
Observe, the just man hesitated to gaze upon himself and instead released a raven to discern if any positive alteration might be anticipated. It is stated, "Having flown out," the raven "flew away and came until the earth was dried up from the water." The Holy Scriptures clarify this point—not due to the raven returning to the ark, but because such a expression is characteristic of its usage. This particular style is found in numerous instances throughout Scripture, of which I could easily point out several; however, to encourage you in your own study, I suggest you explore the Scriptures and uncover where such distinctions occur.
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Now, we must explain why this bird chose to stay outside the ark. It is possible that this unclean creature remained beyond the ark because it encountered the remains of humans and beasts after the waters receded, discovering sustenance within them. This very circumstance provided the just man with a significant reason to maintain hope for a positive outcome. Had the raven encountered no sustenance, it would have returned to the ark. This is confirmed by the fact that the righteous man, buoyed by newfound hope, later released the dove—an innocent and sociable bird that displays unique tendencies and prefers to consume only seeds, distinguishing it as part of the pure avian lineage.