Reference: Muth-labben
Easton
occurring only in the title of Ps 9. Some interpret the words as meaning "on the death of Labben," some unknown person. Others render the word, "on the death of the son;" i.e., of Absalom (2Sa 18:33). Others again have taken the word as the name of a musical instrument, or as the name of an air to which the psalm was sung.
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Fausets
Title of Psalm 9. Labben is an anagram for Nabal ("the fool" or wicked); "concerning the dying (muth) of the fool," as Ps 9:12,16-17, "Thou hast destroyed the wicked, Thou hast put out their name forever and ever." "The wicked is snared in the work of his own hands." Higgaion ("meditation"); Selah ("pause".) "The wicked shall be turned into hell," etc. Saul slain by the Philistines by whom he had sought to slay David, and receiving the last thrust from one of the Amalekites whom he ought to have destroyed, and Nabal ("fool") dying after his selfish surfeit when churlishly he had refused aught to David's men who had guarded him and his, are instances of the death of such world-wise "fools" (1Sa 25:26,38; 2Sa 3:33; Ps 14:1). (See NABAL .) The Septuagint and Vulgate versions read concerning the mysteries of the Son," namely, the divine Son's death, the earnest of His final victory over the last "enemy" (Ps 9:6).