"'The Hebrews say that God appeared to Moses in a bush [(buisson) rather than a tree (arbre)] in order that the Jews might not be able to sculpt of it an idol.'"
Peter the Chanter (d. 1197) on Ex 3:2 according to Gilbert Dahan in L'exégèse chrétienne de la Bible en Occident médiéval, XIIe-XIVe siècle, Patrimoines christianisme (Paris: Les Editions du Cerf, 1999), 381-382. Dahan cites p. 151 of his own "Les interprétations juives dans les commentaires du Pentateuque de Pierre le Chantre," in The Bible in the medieval world: essays in memory of Beryl Smalley, ed. K. Walsh & D. Wood (Oxford: 1985), pp. 131-155.