Esias 41:15

15 Behold, I have made thee as new saw-shaped threshing wheels of a waggon; and thou shalt thresh the mountains, and beat the hills to powder, and make as chaff:

Esias 41:15 In-Context

13 For I am thy God, who holdeth thy right hand, who saith to thee,
14 Fear not, Jacob, Israel few in number; I have helped thee, saith thy God, he that redeems thee, O Israel.
15 Behold, I have made thee as new saw-shaped threshing wheels of a waggon; and thou shalt thresh the mountains, and beat the hills to powder, and make as chaff:
16 and thou shalt winnow , and the wind shall carry them away, and a tempest shall scatter them: but thou shalt rejoice in the holy ones of Israel.
17 And the poor and the needy shall exult; for they shall seek water, and there shall be none, their tongue is parched with thirst, I the Lord God, I the God of Israel will hear, and will not forsake them:

The Brenton translation of the Septuagint is in the public domain.