Habib ibn Zayd al-Ansari was a sahaba and martyr of Islam.
His father, Zayd ibn Asim, was one of the first in Yathrib to accept Islam and his mother, Nusaybah bint Kab(Umm Ammarah) was the first woman to fight in defence of Islam. Habib accompanied his parents, aunt and brother to Mecca with the group of 75 people who pledged loyalty to Muhammad at Aqabah. Habib did not participate in the battle of Badr or the battle of Uhud because he was considered too young to bear arms. Thereafter, however, he took part in all the engagements which Muhammad fought, distinguishing himself by his bravery.
By 630, Islam was the dominant force in Arabia, and the tribes converged on Mecca to proclaim their acceptance of Islam, including a delegation from Najd called Banu Hanifah, who appointed Musailama ibn Habib as their spokesman. On his return to Najd, Musailama recanted his allegiance, claiming to be a prophet himself. For various reasons the Banu Hanilab rallied around him, mostly out of tribal loyalty (asabiyyah). One member of the tribe declared:
"I testify that Muhammad is indeed truthful and that Musaylamah is indeed an imposter. But the impostor of Rabiah (the tribal confederation to which the Banu Hanifah belonged) is dearer to me that the genuine and truthful person from Mudar (the tribal confederation to which the Quraish belonged)."
Before long, the number of Musailama's followers increased and he felt powerful enough to write a letter to Muhammad;
"From Musailama, the messenger of God to Muhammad, the messenger of God. Peace be on you. I am prepared to share this mission with you. I shall have (control over) half the land and you shall have the other half. But the Quraish are an aggressive people." He then wrote to Musailama: "In the name of God, the Beneficent, the Compassionate. From Muhammad the Messenger of God, to Musailama the imposter. Peace be upon whoever follows the guidance. God will bequeath the earth to whosoever of His servants He wishes and the final triumph will be for those who are careful of their duty to God."