פירוש על ברכות 69:11

Cf. Lev. xix. 10. Since the gleanings have to be left behind, he must say a benediction over what he enjoys of the vineyard ; but the law of gleanings does not apply to other fruits, therefore the inference just drawn is not valid.

The law of gleanings does not apply to corn ; and yet a benediction is necessary over bread.