Psalms 6:5

Sheol : the place of the dead

Psalms 30:9

Pit : the place of the dead

pit : the place of the dead

Psalms 88:10-12

Selah : a musical notation for crescendo or emphasis by action (IBD)
(30° 19´, 35° 27´)

Isaiah 38:18-19

Sheol : the place of the dead