כִּ֤י שָׁ֨ם שְֽׁאֵל֪וּנוּ שׁוֹבֵ֡ינוּ דִּבְרֵי־שִׁ֭יר וְתוֹלָלֵ֣ינוּ שִׂמְחָ֑ה שִׁ֥ירוּ לָ֝֗נוּ מִשִּׁ֥יר צִיּֽוֹן׃
For there they that led us captive asked of us words of song, And our tormentors asked of us mirth: ‘Sing us one of the songs of Zion.'
Read halakhic rulings (Jewish law) on Psalms 137:3: and classical halakhic sources.