אֶזְכְּרָ֣ה אֱלֹהִ֣ים וְאֶֽהֱמָיָ֑ה אָשִׂ֓יחָה ׀ וְתִתְעַטֵּ֖ף רוּחִ֣י סֶֽלָה׃
When I think thereon, O God, I must moan; When I muse thereon, my spirit fainteth. Selah .
Read halakhic rulings (Jewish law) on Psalms 77:4: and classical halakhic sources.