Answer :

Following, disagreement with government of Yazid and moving toward Madineh,

Aba Abdollah (peace be upen him) received many messages indicating to the fact that he and his dear family will serve them warmly and the people will support him.

Replying about 14,000/- letters he had received most of them from Koufeh ,Imam Hossein (p.b.u.h) moved toward Mecca and dispatched his cosine, Moslem Ibn Aghil ,one of his faithful friends to go to the people of Koufeh .

This action of Hazrat ,was due to his awareness of situation of the people in Koufeh  and being  insured of their support and their being faithful to their invitation because ,Imam (p.b.u.h) had witnessed identify of the people of Koufeh during the time of Imama Ali and Imam Hassan (p.b.u.h)