Parallel
Psalms 56:8
Rahlfs Septuagint (1935) · Berean Standard Bible
ἑτοίμη ἡ καρδία μου ὁ θεός ἑτοίμη ἡ καρδία μου ᾄσομαι καὶ ψαλῶ
57:7
My heart is steadfast, O God, my heart is steadfast. I will sing and make music.