Albert Barnes Commentary Psalms 70:1

"[Make haste], O God, to deliver me; Make haste to help me, O Jehovah." — Psalms 70:1 (ASV)

Make haste - These words are supplied by our translators. The first word in (Psalms 40:13), rendered “be pleased,” is here omitted in the original. The psalm in the Hebrew begins abruptly - O God, to deliver me, - leaving the impression that this is a fragment, a fragment commencing without even the care necessary to make the grammatical construction complete.

O God - Hebrew, אלהים 'Elohiym. In the corresponding place in (Psalms 40:13) the word is “Yahweh.” Why the change was made is unknown. The remainder of the verse is the same as in (Psalms 40:0).