The repetition of an idea both in Hebrew poetry, as Ps. 8: 4, and in the gospels: e.g. Mark 7: 21; but when Matthew follows Mark, the superfluous words ‘from within’ are omitted by Matt. 15: 19, thus eliminating Mark's pleonasm.
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"pleonasm." In A Dictionary of the Bible. Ed. W. R. F. Browning. Oxford Biblical Studies Online. Mar 30, 2017. <http://www.oxfordbiblicalcstudies.com/article/opr/t94/e1496>.
"pleonasm." In A Dictionary of the Bible. , edited by W. R. F. Browning. Oxford Biblical Studies Online, http://www.oxfordbiblicalcstudies.com/article/opr/t94/e1496 (accessed Mar 30, 2017).