How to hold a scythe with 2 hands? (fixed)

You need to make an animation with the correct position of Left arm, so the tool will follow Right arm's CFrame and adjust the handle for Left arm too, be sure to use the Equipped event:

Tool.Equipped:Connect(function()
  --> Play your animation here!
end)

You have two options on making a two had scythe. You can either A., use an animation and perfectly position it, or B., make a fake arm and weld it to the scythe where ever you want it to be held and do some trigonometry to perfectly position it. I personally prefer the second method, because once you have it you won't have to constantly reposition the arm and spend a lot of time on the animations.