אוֹמְרָ֤ה ׀ לְאֵ֥ל סַלְעִי֮ לָמָ֪ה שְׁכַ֫חְתָּ֥נִי לָֽמָּה־קֹדֵ֥ר אֵלֵ֗ךְ בְּלַ֣חַץ אוֹיֵֽב׃
I will say unto God my Rock: 'Why hast Thou forgotten me? Why go I mourning under the oppression of the enemy?'
Read halakhic rulings (Jewish law) on Psalms 42:10: and classical halakhic sources.