Psalms 44:21 Halakhah

אִם־שָׁ֭כַחְנוּ שֵׁ֣ם אֱלֹהֵ֑ינוּ וַנִּפְרֹ֥שׂ כַּ֝פֵּ֗ינוּ לְאֵ֣ל זָֽר׃

If we had forgotten the name of our God, or spread forth our hands to a strange god; .

Read halakhic rulings (Jewish law) on Psalms 44:21: and classical halakhic sources.