Contradiction with Ecclesiastes 3:20
While Psalms 103:21 calls on spiritual beings to bless the Lord, Ecclesiastes 3:20 states that all go to one place, implying a different fate or journey for all creatures, not focusing on spiritual actions like blessing.
Ecclesiastes 3:20: All go unto one place; all are of the dust, and all turn to dust again.
Contradiction with Matthew 8:28-29
Psalms 103:21 speaks positively of spiritual beings blessing the Lord, whereas Matthew 8:28-29 describes demons acknowledging Jesus but their demeanor and actions are not of blessing.
Matthew 8:28-29: And when he was come to the other side into the country of the Gergesenes, there met him two possessed with devils, coming out of the tombs, exceeding fierce, so that no man might pass by that way.
Contradiction with Isaiah 45:23
Psalms 103:21 encourages blessings upon the Lord, while Isaiah 45:23 emphasizes that every knee shall bow and every tongue shall swear, suggesting a more universal compulsion rather than voluntary blessing by some beings.
Isaiah 45:23: I have sworn by myself, the word is gone out of my mouth [in] righteousness, and shall not return, That unto me every knee shall bow, every tongue shall swear.
Contradiction with 1 Corinthians 15:39
While Psalms 103:21 includes all heavenly hosts in blessing the Lord, 1 Corinthians 15:39 points out differences between creatures, highlighting their varied natures, which can imply different roles or purposes, possibly not all aligned with blessing.
1 Corinthians 15:39: All flesh [is] not the same flesh: but [there is] one [kind of] flesh of men, another flesh of beasts, another of fishes, [and] another of birds.
Contradiction with James 2:19
Psalms 103:21 talks about spiritual beings blessing the Lord, whereas James 2:19 indicates that even demons believe in God and tremble, suggesting acknowledgment without the act of blessing.
James 2:19: Thou believest that there is one God; thou doest well: the devils also believe, and tremble.