Send message only once in on player move event

Hello, the problem is that when someone moves on the block, the message is being sent whenever they move. How can I make it only be sent once?

Code:

@EventHandler
    public void onMovement(PlayerMoveEvent event) {
        final Player p = event.getPlayer();
        if (p.hasPermission("multiwarp.use")) {
            Block blockBelow = p.getLocation().getBlock().getRelative(BlockFace.DOWN);
            if (this.blockLocations.containsValue(blockBelow.getLocation())) {
                p.sendMessage(ChatColor.DARK_GREEN + "Teleporting in " + ChatColor.GREEN + "3 seconds!");
                this.getServer().getScheduler().scheduleSyncDelayedTask(this, new Runnable() {
                    @Override
                    public void run() {
                        //teleport
                    }
                }, 60L);
            }
        } else {
            p.sendMessage(ChatColor.RED + "You don't have permission to use this command!");
        }
    }

 

You would need to implement a cool down. The search bar could yield a lot of info on that matter.

 

You could use event.getFrom() and event.getTo() and check if the blocks are the same.