The connection of these verses with the rest of the psalm is far from plain. Why the psalmist should suddenly be struck with the dreadful thought that death broke the covenant relationship, and silenced prayer and praise, is not easy to see. Was the psalm first chanted after some victory? and was this suggested by the sight of the slain, who, though they had helped to win the triumph, could yet have no share in the praises that were ascending to Jehovah?
Related Commentaries of Psalms 115:17
Psalms 115:17-18
17 The dead praise not the LORD, neither any that go down into silence.
18 But we will bless the LORD from this time forth and for evermore. Praise the LORD.