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 other than Isaiah reveals itself in connection with this Psalm by the echoes of this very Psalm, which are to be found not only in the second but also in the first part of the Isaianic collection of prophecy (cf. on Psa 51:9, Psa 51:18). We are therefore driven to the inference, that Ps 51 was a favourite Psalm of Isaiah's, and that, since the Isaianic echoes of it extend equally from the first verse to the last, it existed in the same complete form even in his day as in ours; and that consequently the close, just like the whole Psalm, so beautifully and touchingly expressed, is not the mere addition of a later age. The Punishment That Awaits the Evil Tongue With Psa 52:1-9,