Peace,
Allah, out of His Mercy, has sent Messengers and Prophets to all Nations on Earth, at different times in the history of mankind. These Messengers came to preach the Truth and to teach Mankind the reality of leading a good and wholesome life on Earth. They taught man to believe in the Oneness of Allah, and to give up their beliefs in other deities. Equating other beings or concepts with Allah is indeed the greatest of sins that a man can commit. They taught man to follow the Straight Path, the Path of those who were blessed by Allah, and not the Path of those who incur the Wrath of Allah. They taught mankind goodness, and to shun evil.
It is said that from the beginning of time, Allah has sent many Messengers and Prophets. These Messengers and Prophets were human, who were born into those nations. They were not angels or supernatural beings. They led human lives, and died as humans. (Except for the Prophet Jesus who shall return). However, they were guided by Allah , and set their lives as examples for other human beings to emulate and follow. Each Messenger was given a Book, a piece of the Scripture that was the Word of Allah. The Word (or Book) of Allah and the examples set by the Messenger or Prophet would become the basis for the followers to lead a wholesome life.
It is inconceivable that a Prophet should have committed fornication. Our Prophet, upon him be peace and blessings, explicitly declared that there is not a single case of fornication in his lineage back to Adam. He also stated that all the Prophets are brothers descended from the same father. Our Prophet is a descendant of Abraham, upon him be peace, as were Judah and the other Israelite Prophets, so it is impossible for any of them to be the child of an illicit intercourse, or — God forbid such a thought! — to have fornicated.
What the Qur’an says about David (Dawuud) peace be upon him:
“Be patient at what they say, and remember Our servant David, the man of strength and abilities. For he ever turned to God in sincere devotion and submission. It was We that made the mountains declare, in unison with him, Our praises, at eventide and at the break of day, and the birds gathered (in assemblies): all with him did turn to Him (in profound devotion). We strengthened his kingdom and gave him wisdom and sound judgement (in speech and decision.) (Sad, 38.17-20)
Though a king, he lived a simple life by his own labour. He cried much out of fear of God and used to fast every other day. This kind of fast was recommended by our Prophet to some of his Companions who sought the most rewarding type of supererogatory fasting. Is it at all conceivable that such a noble Prophet could fornicate and plot the death of his commander in order to take his wife?
What the Qur’an says about the claim that Moses sinned:
Muslims are told in the Qur’an that God did indeed tell Moses to strike to stone with a stick, so in our perspective he did not sin in anyway.
Allah says in the Noble Qur’an:
“And (remember) when Moses asked for water for his people, We said: “Strike the stone with your stick” Then gushed out forth there from twelve spring…..” (2; 60)
Concerning Abraham, it is true that he did tell the King that his wife was his sister, but it should be noted that in Islam this is not considered a sin. Why? Simply because, as you stated already, that he feared for his life and therefore if he told the king a lie to save his life, it is not considered a sin. For us Muslims, there are conditions for a sin, and in this case Abraham did not fulfill those .
The Qur’an absolves the Prophets from all the accusations against them in the Bible and exalts them.
If the Qur’an had not been sent, we could not have known the truth about the previous Prophets. The Qur’an exalts them all as being sincere, devout and thankful servants of God. As it freed Jesus from the deification of Christians and the denial of the Jews and glorified God from Christians’ attributing to Him sons and daughters, so too, it acquitted all the Israelite and non-Israelite Prophets of having committed the disgusting sins attributed to them in the Bible. It mentions Jesus as a spirit from God breathed into the Virgin Mary, Abraham as an intimate friend of God, Moses as one who spoke to God and Solomon as a king and a Prophet who prayed to Him humbly: "O my Lord! So order me that I may be grateful for your favours, which You have bestowed on me and on my parents, and that I may work the righteousness that will please You; and admit me, by Your Grace, to the ranks of Your righteous servants" (al-Naml, 27.19). So, Solomon, besides never having worshipped anything other than God, never committed a sin and, despite being the greatest and most powerful of kings that ever lived, remained a humble servant of God until his death.
Will you not then pray tribute to the Greatest men of Mankind?
Peace and Blessing to the Believers