Psalms 69:15

Let not the waterflood overflow me -The stream; the volume of waters. The idea is that of a flood or stream rolling along, that threatened to drown him. Neither let the deep swallow me up -The abyss; the deep waters. And let not the pit shut her mouth upon me -In his anguish and distress he passes here from the idea of running streams, and deep waters, to that of a well, pit, or cavern - representing himself as “in” that pit, and praying that it might not be closed upon him, leaving him in darkness and in mire, from which he could not then escape.