Genesis 8:6 - Ellicott's Commentary On The Whole Bible

Noah opened the window. — Not the zohar of Genesis 6:16, but an aperture. He had waited forty days after seeing the heights around him rising clearly into the air, and then, impatient of the slow subsidence of the waters, Noah at last sent forth a raven to bring him some news of the state of the earth. This bird was chosen as one strong of flight, and also, perhaps, because anciently regarded as prophetic of the weather; besides this, it is easily tamed, and as Noah retained its mate he had security for its return. And so it seems to have done, for it is described as going “forth to and fro.” Each night it returned to the ark, and probably to its old perch near the female. The Chaldean Genesis agrees with many commentators and the ancient versions in supposing that the raven did not return, finding abundant food in the floating dead bodies (Chaldean Genesis, p. 286); but this is contrary to the Hebrew. The versions must have had a negative in their copies, and have read, “which went forth, going, and not returning.” The present Hebrew text is, however, consistent with itself; for it adds, “until the waters,” &c. This must mean that as soon as the earth was dry this going to and fro ceased.