You will winnow them, and a wind will carry them away; a gale will scatter them. But you will rejoice in the LORD; you will glory in the Holy One of Israel.
16. Thou shalt winnow them. The meaning is the same as in the former verse, but by a different metaphor; for he compares the Church to a sieve, and wicked men to the chaff which is driven away by the sieve and scattered in every direction.
The scope of these verses is to silence the fears, and encourage the faith, of the servants of God in their distresses. Perhaps it is intended, in the first place, for the support of God's Israel, in captivity; but all that faithfully serve God through patience and comfort of this scripture may have hope.
Commenting on Isaiah 41:10-20
Thou shalt fan them, and the wind shall carry them away, and the whirlwind shall scatter them,.... In illusion to the custom of the Jews, who had their threshingfloors on the tops of hills and mountains, where they took the opportunity and advantage of the wind in winnowing their corn, which fanned it, and carried away the chaff, and scattered it abroad; in like manner...