From Feast of trumpets I, 1884, by the Polish painter Alexander Gierymski. Wikimedia.
Just before the start of the musaf (“additional”) service in Ashkenazi synagogues on Rosh Hashanah and Yom Kippur, the prayer leader chants a personal entreaty begging God to be merciful to His people, gathered at this season in repentance of their sins. The prayer is known by its opening words hineni he’ani mimaas, “Here am I, poor in deeds. . . .” In all of halakhic literature there seems to be only one reference to it, by Rabbi Ephraim Zalman Margolis of Galicia (1762–1828), who wrote: