KJV : My heart <03820> is fixed <03559> (8737), O God <0430>, my heart <03820> is fixed <03559> (8737): I will sing <07891> (8799) and give praise <02167> (8762). {fixed: or, prepared}

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NASB : My heart is steadfast, O God, my heart is steadfast; I will sing, yes, I will sing praises!

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NASB# : My heart<3820> is steadfast<3559>, O God<430>, my heart<3820> is steadfast<3559>; I will sing<7891>, yes, I will sing<2167> praises<2167>!