1 Kings:17.1
Then the word of the LORD came to him, saying, "Get away from here and turn eastward, and hide by the Brook Cherith, which flows into the Jordan. "And it will be that you shall drink from the brook, and I have commanded the ravens to feed you there."
The ravens brought him bread and meat in the morning, and bread and meat in the evening; and he drank from the brook.
But according to Mosaic law, these birds are unclean ceremonially.
Leviticus:11.13 ' And these you shall regard as an abomination among the birds; they shall not be eaten, they are an abomination...... 'every raven after its kind
These passages show that ravens would have been despised by law and tradition from the days of Moses. Why then should Elijah be fed using means that could affect his credibility.