הוֹד֤וּ לַיהוָה֙ כִּ֣י ט֔וֹב כִּ֥י לְעוֹלָ֖ם חַסְדּֽוֹ׃
O danke dem HERRN! denn er ist gut; Denn seine Barmherzigkeit währt ewig.
Rashi
to give thanks with musical instruments, for they recited (Ps. 136): “Give thanks to the Lord for He is good, for His loving kindness is eternal.”