When Imam sent Jareer bin Abdullah Bajali towards Muawiya, and there was a delay in his return, he wrote:
When you receive this letter of mine ask Muawiya to take a final decision and to follow a determined course. Then ask him to choose either war that externs him from home or ignoble peace. If he chooses war leave him alone, but if he chooses peace, secure his allegiance. Wasalaam.