The existence of a personality like Muhammad (P.B.U.H.) who has been the establisher and the care-taker of a great divine religion like Islam necessitates adequate search and study-even though promptly- about his ancestors of prophets especially when we put in mind that semi-great relationship between Islam and the other heavenly religions with regard to content even though their forms differ from one another. And here, we have to pass away so fast with these ancestors whose starting-point stemmed from the Prophet Ishmael bin Abraham's branch up to the Prophet Adam (P.B.U.H.).
1. Ishmael: It is verily, the first branch of prophet-hood which is associated with Muhammad (P.B.U.H.) by way of his wife Sara who at the time being was an old woman and sterile and impotent, considering the birth of Ishmael, the son of Abraham (P.B.U.H.) as one of the miracles of Abraham and the most important of bounties bestowed to him.

When he was thirteen years old, his father, Abraham had seen a bewildering sleep: that he was ordered to slaughter Ishmael and that was really enacted by the prophet Abraham and his son Ishmael which was a crucial test and scaring as well, at the same time but they both, despite that, welcomed the divine revelation wherein Ishmael had said his famous say upon which the holy Quran had touched:
"O father! Do what you were ordered and you will find me one of the patient."(Al-Safat: 102)
Just then, the divine call came: "And We called him: " O Abraham! What you have seen in your sleep has come true and We as such recompense the charitable"(Al-Safat-105) during which both have passed the test so successfully that the whole of the angels were highly amazed before mankind.
2. Abraham: Heroism can be felt embodied in its finest apparel and positive sense through the same prophet Abraham for he fought a thorough society which all reject the belief in the unification of Allah individually and made great efforts to establish pillars of unification and erase the roots of paganism. He has been the unique resisting man in his nation to be later on in Allah's sight "a whole nation in one man?

Abraham was born in the Iraqi city of Babylon which was under the rule of the then Nimrod bin Kan'an whom the Christian Gospel has described as being: "The mightiest hunter in front of the Lord who gradually grew up to become the mightiest ruler and on the earth and many a man were obliged at the time being to worship him and the worshipping of idols. 
Nimrod came, later on, to know that his throne was about to collapse on the hand of someone whose birth will be settled in his own environment; so, he gave an order to isolate males from females to avoid the occurrence of the catastrophe which may befall him at any moment but Allah's Will aimed to have that blessed semen of the prophet Abraham be joined at the same night when his orders were issued but the matter did not stop at that limit.  
Nimrod, by using his own will and might, and through his authority and armies, was determined to kill every newly-born male during those times but his mother bore him (Abraham) in secret and laid him on a mountain adjacent to the city and there he stayed for thirteen years whereof he came and mixed with the people to recognize then the phenomenon of worshipping other than the One Allah. 

From this same point, Abraham endeavored to fight this belief starting his call with his family, the first of whom was his uncle Aazar who was an idolater, then he carried on fighting against the beliefs of those who worship planets and stars and he reinforced his claim with strong and brilliant proofs through which he defeated their practices.
3. Noah: The Prophet Noah (P.B.U.H.) is described as being a symbol of patience and resistance due to what he suffered from worries, harms and troubles through his march in performing his message and the act of delivering it to his people.
He availed no effort in calling people to believe in Allah as being One and promote the notion of unification in the hearts and that there is no God in the whole universe other than Allah, to Whom be ascribed all glory and perfection. He employed a two-way call to convey his message to the people, namely-in secret and in public; therefore, he accomplished this task of unification in secret and in public and he was the first to inspire the idea of making the Arc. Noah is said to have lived two thousand and five years according to what some narrators say.
4. Driss: and his name in the Torah is "Sonoch" and in Arabic is called "Driss."  In addition to his prophet-hood, he was a scientist in astronomy, mathematics and the art of deciphering human features. He was the first to teach mankind the science of tailoring. (sewing clothes)
5. Adam: He (P.B.U.H.) was the first of Allah's caliphs on earth and His messenger and he and his wife "Eve" were the cause of the human existence on earth as Allah willed it, and both were the first of Allah's whole human creation on earth and Allah Himself ordered all the angels to prostate to Adam except Satan who opposed Allah's order in a renowned story whose details were mentioned in the heavenly books.
And right now, let us get back anew to the details of Muhammad's biography (P.B.U.H.).