How do you make a script so that people with a certain game pass could only sprint?

I wanted to the same thing on my 2nd game I ever made. It worked. Take into account that I have no clue wether your run script is in a local script or in a regular script, so I will do something different that should be easier to you:

Getting Started

Go ahead into Workspace and insert aScript. Now Move your run script Lighting. Name the script you just made "GamePassRun" and name your run script "RunScript" In the script we just made we will define a variable. This variable will tell the script what the gamepass id is. Go to the gamepass you made on roblox.com, and on the link at the top of the screen, it should say something like this: roblox.com/gamepass/run-gamepass/id?=123456/ copy the numbers after it says id onto your clipboard. The other variable will define your run script now we will begin the script:

local id = 123456 -- gamepassId
local RunScript = game.Lighting.RunScript-- this tells the script what your run script is.

now we will continue the script, I'll explain along the way:

local id = 123456 -- paste the id you copied instead of these numbers
local RunScript = game.Lighting.RunScript -- this tells the script what your run script is.

game.Players.PlayerAdded:Connect(function(player) -- this adds a function to the player when he/she joins
if game:GetService("GamePassService"):PlayerHasPass(player, id) then -- this checks if the player has the gamepass
 local clone = RunScript:Clone() -- Clones your script
 clone.Parent = player -- Moves the run script into the player
else
 print(player.Name.. "Does not have pass, Script Failed to make" ..player.Name.." Sprint")--Prints that the player does not have the gamepass needed to be able to sprint.
 end
end)

raw:

local id = 123456
local RunScript = game.Lighting.RunScript

game.Players.PlayerAdded:Connect(function(player)
if game:GetService("GamePassService"):PlayerHasPass(player, id) then
    local clone = RunScript:Clone()
    clone.Parent = player
else
    print(player.Name.. "Does not have pass, Script failed to make " ..player.Name.." sprint")
    end
end)