καθὼς introduces a prophetic citation as protasis to the historical statement about John in Mark 1:4 = in accordance with, etc., John appeared. The prophetic reference and the historical statement are given in inverse order in Matthew. ἐν τῷ Ἠσαίᾳ, in Isaiah, the actual quotation being from Isaiah and Malachi (Mark 1:2) conjointly. An inaccuracy doubtless, but not through an error of memory (Meyer and Weiss), but through indifference to greater exactness, the quotation from Isaiah being what chiefly occupied the mind. It is something analogous to attraction in grammar. It is Mark's only prophetic citation on his own account. ἰδοὺ begins the quotation from Malachi 3:1, given as in Matthew 11:10, with μου, after προσώπου and ὁδόν, changed into σου.

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Old Testament