How can I tell when someone is holding their mouse down?

I use something like this: Basically you need to spawn a loop that checks if a variable called "MouseDown" is true, and when the mouse event Button1Down is called, set the variable to true, but when Button1Up is called, set the variable to false.

As long as this is in a local script it will work.

EDIT: Added a renderstepped wait to the loop

local player = game.Players.LocalPlayer;
local Mouse = player:GetMouse();

local MouseDown = false;

local rs = game["Run Service"].RenderStepped; -- Faster loop
function MouseChecker()
    while true do
        rs:wait();
        if (MouseDown == true) then
            print("Mouse is down");
            -- repeat code here while the mouse is down
        end
    end
end

Mouse.Button1Down:Connect(function()
    MouseDown = true;
end)

Mouse.Button1Up:Connect(function()
    MouseDown = false;
end)

spawn(MouseChecker);