David
Psalm 9:12ESV·traditional attribution

For he who avenges blood is mindful of them; he does not forget the cry of the afflicted.

John Calvin Reformed @genevareformer

Psalm 9 David, after having recounted the former victories which he had gained, and exalted in lofty strains the grace and power of God in their happy issue, now again, when he sees new enemies and dangers rising up, implores the protection of the same God by whom he had before been delivered, and beseeches him to overthrow the pride of his enemies. To the chief musician Almuth Laben.

Commenting on Psalm 9:1-20

C.H. Spurgeon Reformed Baptist @princeofpreachers

When an inquest is held concerning the blood of the oppressed, the martyred saints will have the first remembrance; he will avenge his own elect. Those saints who are living shall also be heard; they shall be exonerated from blame, and kept from destruction, even when the Lord's most terrible work is going on; the man with the inkhorn by his side shall mark them...

Matthew Henry Presbyterian @wholebiblehenry

In these verses, I. David, having praised God himself, calls upon and invites others to praise him likewise, Psa 9:11. Those who believe God is greatly to be praised not only desire to do that work better themselves, but desire that others also may join with them in it and would gladly be instrumental to bring them to it: Sing praises to the Lord who dwelleth in Zion.

Commenting on Psalm 9:11-20