Commentary for Psalms 78:20

הֵ֤ן הִכָּה־צ֨וּר ׀ וַיָּז֣וּבוּ מַיִם֮ וּנְחָלִ֪ים יִ֫שְׁטֹ֥פוּ הֲגַם־לֶ֭חֶם י֣וּכַל תֵּ֑ת אִם־יָכִ֖ין שְׁאֵ֣ר לְעַמּֽוֹ׃

Behold, He smote the rock, that waters gushed out, And streams overflowed; Can He give bread also? Or will He provide flesh for His people?'

Rashi on Psalms