Sforno on Numbers 13:33/ספורנו על במדבר י״ג:ל״ג

1בני ענק, descended paternally from giants

2מן הנפילים, maternally descended from those giants.

3וכן היינו בעיניהם, like grasshoppers, or even less significant. They did not bother to harm us as they did not think we represented a threat to them.