שמואל ב יד:יט פירוש: רש״י

It is impossible. [This is] like "if it is possible" or like "is it possible" So too [we find] "Is there in the house of a wicked person"⁷Micha 6:10. meaning "is there".⁸הָאִש is standing in for הֲיֵשׁ which means “is there”.