פירוש על במדבר 24:10

ויספק means he clapped one hand upon the other.

ויספק את כפיו, as a sign that he had abandoned hope of achieving his objective, seeing that Bileam was cursing those whom he wanted to be the cursers.

ויתר אף בלק..ויספק את כפיו, "Balak became angry… and clapped his hands, etc." He expressed his anger by clapping his hands together.