A raven was sent out of the ark by Noah (Gen. 8: 6), but it was regarded as ceremonially unclean in the Law (Lev. 11: 15, in the Priestly source). The prophet Elijah was brought bread by ravens when he lived east of the Jordan (1 Kgs. 17: 6).
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"raven." In A Dictionary of the Bible. Ed. W. R. F. Browning. Oxford Biblical Studies Online. Feb 8, 2016. <http://www.oxfordbiblicalcstudies.com/article/opr/t94/e1589>.
"raven." In A Dictionary of the Bible. , edited by W. R. F. Browning. Oxford Biblical Studies Online, http://www.oxfordbiblicalcstudies.com/article/opr/t94/e1589 (accessed Feb 8, 2016).