Isaiah 26:3 Halakhah

יֵ֣צֶר סָמ֔וּךְ תִּצֹּ֖ר שָׁל֣וֹם ׀ שָׁל֑וֹם כִּ֥י בְךָ֖ בָּטֽוּחַ׃

The mind stayed on Thee Thou keepest in perfect peace; Because it trusteth in Thee.

Read halakhic rulings (Jewish law) on Isaiah 26:3: and classical halakhic sources.