וְֽ֭יֵדְעוּ כִּי־יָ֣דְךָ זֹּ֑את אַתָּ֖ה יְהוָ֣ה עֲשִׂיתָֽהּ׃
That they may know that this is Thy hand; That Thou, LORD, hast done it.
Read halakhic rulings (Jewish law) on Psalms 109:27 from the Mishneh Torah and classical halakhic sources, free online.