'Pruning knives' in the Bible

And he shall judge among the nations, and shall reprove many peoples; and they shall forge their swords into ploughshares, and their spears into pruning-knives: nation shall not lift up sword against nation, neither shall they learn war any more.

For before the harvest, when the blossoming is over, and the flower becometh a ripening grape, he shall both cut off the sprigs with pruning-knives, and take away and cut down the branches.