All my bones. all the members of my body. Interpretation belongs to the speaker. The Application belongs (1) to the O.T. saints (Psalms 139:13-16), and (2) to the later members referred to in Ephesians 1:22; Ephesians 1:23; Ephesians 2:21; Ephesians 4:4-16. Note their experiences: Psalms 6:2 (vexed); Psalms 22:14 (out of joint); but "not broken" (Psalms 34:20 John 19:36; Exodus 12:46); His heart broken (Psalms 69:20); so our hearts (Psalms 34:18); but not ourselves (John 10:27-29).
say. They speak: and always of HIM. Figure of speech Prosopopoeia, for emphasis. They all and always confess Christ as LORD (1 Corinthians 12:3; 1 Peter 3:15).
who is like... ? Figure of speech Erotesis (App-6), for greater emphasis. Compare their words (Psalms 71:19; Psalms 73:25; Psalms 89:6; 1 Samuel 2:2.Deuteronomy 33:26; Deuteronomy 33:27).
deliverest. rescuest. Compare 2 Timothy 4:18; 2 Peter 2:9.
poor. oppressed. Compare Psalms 34:6.
too strong. Law too strong (Galatians 1:3; Galatians 1:10; Galatians 1:13); sin too strong (Romans 5:21); the world too strong (John 16:33); self too strong (Romans 7:24); death too strong (2 Timothy 1:10).