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I think this is a chiasmus. It requires some commentary, but for now I thought I would just post it. 🙂
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1 (For the choir director. A Psalm of David; for a memorial.)
A a O God, b hasten to deliver me!
B a O LORD, / b hasten to my help!
C 2 Let those be ashamed and humiliated
D Who seek my life;
E Let those be turned back and dishonored Who delight in my hurt.
E’ 3 Let those be turned back because of their shame Who say, “Aha, aha!“
D’ 4 Let all who seek Thee
C’ rejoice and be glad in Thee – And let those who love Thy salvation say continually, “Let God be magnified.”
B’ 5 But I am afflicted and needy; b’ Hasten to me, / a’ O God!
A’ b’ Thou art my help and my deliverer; a’ O LORD – do not delay.
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The end of the chiasmus also appears to be a small chiasmus:
a 5b Hasten to me,
b O God!
c Thou art my help and my deliverer;
b’ O LORD,
a’ do not delay.
Biblical Chiasmus 