Reference for Psalms 119:52

זָ֘כַ֤רְתִּי מִשְׁפָּטֶ֖יךָ מֵעוֹלָ֥ם ׀ יְהוָ֗ה וָֽאֶתְנֶחָֽם׃

I have remembered Thine ordinances which are of old, O LORD, and have comforted myself. .

ספר השרשים