According to a tradition among the Jews, if a psalm is not attributed to anyone, then the credit should go to the author of the previous psalm. This is no basis for being dogmatic, but this would mean that Psalm 91 was composed by Moses. The reason this is suggestive is that the theme of this psalm fits the experience of Israel in the wilderness in remarkable ways. In addition, it is striking that the devil quotes from this psalm when Jesus was being the victorious Israel, during His temptation in the wilderness.
