יְהוָה֮ יִגְמֹ֪ר בַּ֫עֲדִ֥י יְ֭הוָה חַסְדְּךָ֣ לְעוֹלָ֑ם מַעֲשֵׂ֖י יָדֶ֣יךָ אַל־תֶּֽרֶף׃
The LORD will accomplish that which concerneth me; Thy mercy, O LORD, endureth for ever; Forsake not the work of Thine own hands.
Read halakhic rulings (Jewish law) on Psalms 138:8: and classical halakhic sources.