1.

Make haste, O God, to deliver me; make haste to help me, O LORD.

Title. of David = relating to David.
to bring to remembrance: what is written in Psalms 40:13-17 . Repeated here to complete the Structure of this second book (see p. 759).
Make haste. Supply. Ellipsis ( App-6 ) from Psalms 40:13 ; "Be pleased".
God. Hebrew. Elohim. App-4 .
LORD. Hebrew. Jehovah. App-4 .

2.

Let them be ashamed and confounded that seek after my soul: let them be turned backward, and put to confusion, that desire my hurt.

Let them. Note the repeated alternation here.
my soul = me (emphatic). Hebrew. nephesh. App-13 .

3.

Let them be turned back for a reward of their shame that say, Aha, aha.

That say. Some codices, with Aramaean, Septuagint, Syriac, and Vulgate, read "Who are saying to me". Compare Psalms 40:15 .
Aha, aha. Figure of speech Epizeuxis. App-6 .

4.

Let all those that seek thee rejoice and be glad in thee: and let such as love thy salvation say continually, Let God be magnified.

rejoice. Put by Figure of speech Metonymy (of the Subject), for "have cause to rejoice", &c.
God. Hebrew. Elohim. App-4 . Some codices, with Aram, and Vulgate, read "Jehovah".

5.

But I am poor and needy: make haste unto me, O God: thou art my help and my deliverer; O LORD, make no tarrying.

poor = wretched, or oppressed. Hebrew. 'anah. See note on Proverbs 6:11 .
O LORD. Some codices, with six early printed editions and Syriac, read "O my God". Compare Psalms 40:17 .