Genesis 8:7 (BSB)

and sent out a raven. It kept flying back and forth until the waters had dried up from the earth.

From Genesis 8. Also in the ESV.

Commentary on Genesis 8:7

• Matthew Henry (Presbyterian), Matthew Henry's Complete Commentary on Genesis 8:6-12: We have here an account of the spies which Noah sent forth to bring him intelligence from abroad, a raven and a dove. Observe here, I. That though God had told Noah particularly when the flood would come, even to a day (Gen 7:4), yet he did not give him a particular account by revelation at what times, and by what steps, it should go away, 1.
• John Gill (Reformed Baptist), Exposition of the Old and New Testaments on Genesis 8:7: And he sent forth a raven,.... That by it he might make his observation, how high or low the waters were upon the earth; and the rather he sent out the raven, a bird of prey, which feeds on carrion, that if the earth had been dry, the smell of the dead carcasses would have invited it to go far off from the ark, and...
• Jamieson-Fausset-Brown (Reformed), Commentary Critical and Explanatory on the Whole Bible on Genesis 8:7: And he sent forth a raven--The smell of carrion would allure it to remain if the earth were in a habitable state. But it kept hovering about the spot, and, being a solitary bird, probably perched on the covering.
• Adam Clarke (Methodist), Clarke's Commentary on the Bible on Genesis 8:7: He sent forth a raven, which went forth to and fro - It is generally supposed that the raven flew off, and was seen no more, but this meaning the Hebrew text will not bear; ויצא יצוא ושוב vaiyetse yatso vashob, and it went forth, going forth and returning. From which it is evident that she did return, but was not taken into the ark.