Sounds like a bad vampire movie: “He Who Requires Blood”,
though only to our modern ears, of course. The author of Psalm 9 made no such
silly Hollywood associations and neither did his original readers. The subject
was deadly serious:
“Sing praises to the Lord, who sits enthroned in Zion!
Tell among the peoples his deeds!
For he who requires blood is mindful of them;
he does not forget the cry of the afflicted.” (Psalm 9:11,12)
If you were – or are – one of the “afflicted”, this is very
good news. The word “peoples” here refers to nations. David is looking forward
to a time when the Lord Jesus will reign over the earth and will “judge the
world in righteousness” and “execute judgement for the [nations] with equity”.
He is occupied here with the absolute fairness of God’s ways
with man.