Rashi: To exile them and move them greatly among the nations. Radak - I decree this.

Malbim: This explains the Hashgachah to move Yisrael among all the nations, until they will be scattered among all of them. This benefits them - they will not be Batel in any place, and no nation will rule over them to eradicate them.

Rashi: After the fine bran fell from it, and the coarse bran remains, which cannot leave, one moves it ¹ with all his strength.

Radak: A wheat kernel is moved around in a sifter, and the earth and chaff fall to the ground. The good kernels, which are big, remain above. Also the pebbles [mixed with the grain] are big and remain above. So Yisrael will be moved among the nations. Only the sinners among them, who are like earth and chaff, will fall. They have no hope for redemption, and will not repent from their sins. Those who will be alive at the time of the Ge'ulah, and those who died in Galus amidst Teshuvah, they will see the Ge'ulah ² and return to their land and not fall to the ground.

Malbim: One puts wheat and barley in a sifter, and move it to clean the grain from the chaff; the fine chaff leaves via the small holes in the sifter. The Tzeror ³ , i.e. full seeds in which flour is Tzarur (wrapped), remains in the sifter. So via scattering and exiles, the Resha'im will fall and assimilate among the nations, but the Tzadikim who are Tzerurim in the Tzeror of Torah, Mitzvos and the unity of Yisrael, will not fall. They will remain in their Emunah.