Reference for Psalms 9:4

בְּשׁוּב־אוֹיְבַ֥י אָח֑וֹר יִכָּשְׁל֥וּ וְ֝יֹאבְד֗וּ מִפָּנֶֽיךָ׃

When mine enemies are turned back, They stumble and perish at Thy presence;