read my lips
US /riːd maɪ lɪps/
UK /riːd maɪ lɪps/

1.
used to emphasize that what one is saying is important and should be clearly understood, often implying no room for negotiation or misunderstanding
:
•
I am not buying you a new toy. Now, read my lips: NO.
•
We are leaving at 8 AM sharp, read my lips, no exceptions!