Answer 1 (Shia Islam view)
According to Shia Islam Messenger of God Muhamamd SAWW left his divine knowledge granted by God needed for leading human as heir for Imam Ali a.s. and so Imam Ali a.s. never said I do not know and always others asked him questions in different fields. some of his sayings is collected in a book called Nahj ul Balaghal that by reading it his high level of knowledge can be understood. he has also sayings about empirical knowledge. for example he said any creature that puts egg its ears are inside his body and any creature that has Childbirth its ears are out of body. this knowledge include knowledge of everything in nature and everything that are needed for humans to can meet God and become same as God.
According to shia Islam the first 3 of them could not understand Quran correctly and so asked from Imam Ali a.s. always and many times decided wrong. according to shia the hadith that says those 3 are accepted in paradise is not an authentic hadith because two of 10 who are said to be accepted in paradise fought in Camel war (Talha and Ali a.s.) and it is logically impossible two enemy who fight each other and one is killed in the same war be in paradise. according to shia Islam those 3 did not obey prophet SAWW about leadership of Ali a.s. and devoted themselves for power in the name of Islam. they were not fair. for example the attack to home of daughter of prophet SAWW for enforcing Ali a.s. to give pledge of alliance to the first or killing Saad Ibn Ibadeh or killing of Malik and raping his wife with no action from the govt and many other examples. they changed rules of Islam. for example in Islam making Mustahab prayers in Jammat is forbidden by they made the Taraweeh prayer as Jamaat and many other examples.
Answer 2 (Sunni Islam view)
The four Caliphs have the following as common to prophet Muhammad (peace be upon him):
The Rashidun Caliphate was the first of the four major caliphates established after the death of the Islamic prophet Muhammad. It was ruled by the first four successive caliphs (successors) of Muhammad after his death in 632 CE (AH 11). These caliphs are collectively known in Sunni Islam as the Rashidun, ... However, after six months the group made peace with Abu Bakr and Ali ...
There is no relation at all between prophet Muhammad (PBUH) and Alaadin. Nothing is common between them. Nothing even to compare between them.
Because Muslims love the Prophet Muhammad (peace and blessings of Allah be upon him).
The most common Islamic name is Muhammad or Ahmed or Mahmoud. This name is referring to prophet Muhammad (peace be upon him)
Abdullah is a very common name for Muslim boys. Abdullah was also the name of the of the father of Muhammad. Muhammad was the Muslims last Messenger and Prophet.
A:Jewish tradition, subsequently accepted by both Christianity and Islam, is that Abraham was the personal ancestor of both the Jews and the Arabs. This tradition would make him the common ancestor of prophet Muhammad and Jesus Christ.
Muhammad is a common Arabic name that means "praiseworthy" or "highly praised." It is also the name of the founder of Islam, Prophet Muhammad, who is considered by Muslims to be the last messenger of God.
Lots of men did. Polygamy was very common back then.
What needs to be understood that as far as the religion is concerned they have almost everything in common (upto 90%). However the major difference arises out of their understanding of history . They both interpret it differently. For the sunnis the history is a 'golden period' and for the Shiites the 'golden period' ended with the departure of Prophet Muhammad (Peace Be Upon Him). The shiites believe that The Prophet's son-in-law Ali was his rightful successor whereas the sunnis believe that the Prophet's successors were the four rightful caliphs Abu Bakar , Umar , Uthman and Ali.
Prophet Muhammad conveyed to Muslims the Holy Quran that reflects real God words revelation to him through the angel Gabriel (Jibril). Accordingly all Islam teachings are per God revelation to prophet Muhammad and not per prophet Muhammad own choice or borrowing from other religions. The three religions are from same God. So, what is common and similar in the three religions are per God will and what is different is also per God will. Refer to questions below for more information.
As I believe, Qualities of four Caliphs.Abu Bakr Siddiue (R.A) - Friendship, Approach, CourageUmar (R.A) - Self-DisciplineUsman Ghani (R.A) - Will Power and DeterminationAli (R.A) - KindnessAnswer 2According to Shia Islam the first 3 of them have not been legimate Caliphs. because in Shia Islam Caliph is representative of God on earth and only God has the right to select his representative according to Quran. and God did not elect those first 3.
Arabic is the common language for Muslims all around the world. It was the official language of their Prophet Muhammad. Many other people speak it to all in the Middle East and Northern Africa.