Therefore their inhabitants were of small power, they were dismayed and confounded: they were as the grass of the field, and as the green herb, as the grass on the housetops, and as corn blasted before it be grown up.
Therefore - Not because of thy power, but because I made them unable to withstand thee.
(As) the grass - which easily withers (Isaiah 40:6; Psalms 37:2).
On the housetops - which, having little earth to nourish it, fades soonest (Psalms 129:6-8).
Corn blasted before it be grown up.