Save my life!
Deliver me for the sake of your steadfast love.
There is no remembrance of you.
Who can give you praise?”
David wanted Yahweh to save his life. He wanted to be delivered from death because of the steadfast love of Yahweh. He pointed out that in death there is no remembering Yahweh. In Sheol, the dark place of after death no one could praise Yahweh because they were separated from God. There was not a concept of eternal life with God, just the banishment to Sheol, the underworld.