Psalms 57:8 Halakhah

נָ֘כ֤וֹן לִבִּ֣י אֱ֭לֹהִים נָכ֣וֹן לִבִּ֑י אָ֝שִׁ֗ירָה וַאֲזַמֵּֽרָה׃

My heart is stedfast, O God, my heart is stedfast; I will sing, yea, I will sing praises.

Read halakhic rulings (Jewish law) on Psalms 57:8: and classical halakhic sources.