Contradiction with Ecclesiastes 9:5
While Psalms 49:19 suggests that consciousness or awareness continues after death, Ecclesiastes 9:5 indicates that the dead know nothing, contradicting the notion of ongoing awareness.
Ecclesiastes 9:5: For the living know that they shall die: but the dead know not any thing, neither have they any more a reward; for the memory of them is forgotten.
Contradiction with Job 14:21
Psalms 49:19 implies an ongoing awareness beyond death, while Job 14:21 suggests that the deceased have no knowledge of what happens to their descendants.
Job 14:21: His sons come to honour, and he knoweth [it] not; and they are brought low, but he perceiveth [it] not of them.
Contradiction with Isaiah 38:18
Psalms 49:19 implies continuation beyond life, whereas Isaiah 38:18 states that Sheol (the grave) cannot praise or thank God, contradicting any active participation after death.
Isaiah 38:18: For the grave cannot praise thee, death can [not] celebrate thee: they that go down into the pit cannot hope for thy truth.
Contradiction with Psalm 115:17
Psalms 49:19 implies post-mortem consciousness, but Psalm 115:17 says the dead do not praise the Lord, which suggests an absence of awareness or activity.
Psalm 115:17: The dead praise not the LORD, neither any that go down into silence.