i will just copy the laws here:
Law 24.4. Bowler throwing towards striker’s end before delivery
If the bowler throws the ball towards the striker’s end before entering his delivery stride, either umpire shall call and signal No ball. See Law 42.16 (Batsmen stealing a run). However, the procedure stated in 2 above of caution, informing, final warning, action against the bowler and reporting shall not apply.
Law 42.16. Batsman stealing a run
It is unfair for the batsmen to attempt to steal a run during the bowler’s run up. Unless the bowler attempts to run out either batsman - see 15 above and Law 24.4 (Bowler throwing towards striker’s end before delivery) - the umpire shall
(i) call and signal Dead ball as soon as the batsmen cross in such an attempt.
(ii) inform the other umpire of the reason for this action.
(iii) return the batsmen to their original ends.
(iv) award 5 penalty runs to the fielding side.
(v) inform the batsmen, the captain of the fielding side and, as soon as practicable, the captain of the batting side, of the reason for this action.
(vi) together with the other umpire report the occurrence as soon as possible after the match to the Executive of the batting side and to any Governing Body responsible for the match, who shall take such action as is considered appropriate against the captain and players concerned.