When thousands of letters from Kufans, inviting Imam Hussain (AS) to come to Kufa, to support him, and pledge allegiance to him, Imam Hussain sent his cousin Muslim b. ‘Aqeel (RH)to report him the news of Kufans, to check their intentions, and to take the pledges of allegiance and their promises of obedience to imam Hussain (AS). He (AS) wrote them a letter and sent it with him. The most important thing about this letter is the praising of Imam Hussain (AS) to him.