The Shahada (Arabic: الشهادة, "the testimony") is an Islamic creed declaring belief in the oneness of God (tawhid) and the acceptance of Muhammad as God's prophet. The declaration, in its shortest form, reads (right to left in Arabic):
لَا إِلٰهَ إِلَّا ٱلله مُحَمَّدٌ رَسُولُ ٱلله
lā ʾilāha ʾillā llāh muḥammadun rasūlu llāh
There is no god but God.
Tashahhud is an obligatory part of Salah which must be performed exactly as the Prophet (SAWA) and Ahlul Bayt (AS) taught us to perform according to the authentic Prophetic Hadeeth (Perform Salah as you saw me performing Salah) (Sallo Kama Ra'aitomooni Osalli)صَلّوا كما رأيتموني أُصَلّي.
Imam Jafar Al-Sadiq (AS) taught his followers all details of Salah including Tashahhud. ( Amaali Al-Shaikh Al-Sadouq , page 498 narrating from Hammaad Bin Easa).
Tashahhud must have ALLAHUMMA SALLI 'ALA MUHAMMAD WA AALI MUHAMMAD which mentions Imam Ali (AS) and all the Infallible Ahlul Bayt (AS).
We are not allowed to add on Tashahhud more than what Ahlul Bayt (AS) taught us.
We can mention the name of Imam AALI (AS) in the form of Du'a within our Salah after Tashahhud, like saying : ALLAHUMMA SALLI 'ALA AMEERIL MO'MINEEN. Du'a is always good within our Salah and not only in Qunoot.
By this Du'a, we will be mentioning the holy name of Ameerul Mo'mineen (AS) and not adding on the Tashahhud which was been taught to us by Ahlul Bayt (AS).
Shirk is calling someone God, assigning divinity to someone other than God, or assigning the offices of divinity to someone other than God.
Saying "'Ali is the wali of God" is not shirk, because it is not doing any of the above.
Furthermore, the Qur'an speaks of the "awliya' Allah" (plural of wali) with respect to human beings. Therefore, it is not shirk to say that Imam 'Ali is the wali of Allah, since Allah uses that phrase Himself. Given his high level of spirituality and service to Islam, very few Muslims would disagree with the idea behind saying "'Ali is the wali of Allah," although this phrase has become associated with Shi'ism.
Therefore, the biggest objection that someone could put forward to saying this in the adhan is that it does not belong in the adhan, not that it is shirk or an untrue statement.
It is not necessary to say "'Ali is the wali of Allah" in the adhan or kalimah. It is optional to say that. Shi'is generally do not consider it part of the adhan or salat. If it is said in the adhan, it is said as an optional thing which is said for blessings, or because it is seen as recommended, not as an actual part of the adhan. This is similar to how one might recite salawat after the Prophet's name during the adhan - it is done as an optional thing and not out of the belief that it is a formal part of the adhan.
For matters of religious law, such as the salat or converting to Islam, it is enough to say "there is no God but Allah and Muhammad is his Prophet".
However, due to the Shi'i belief in the Imamate, some Shi'is might feel it is a more complete or comprehensive statement of faith to also say "'Ali is the wali of Allah" (because the 3 statements cover monotheism, prophethood, and imamate); one might also say it to indicate a desire to convert specifically to Shi'ism. But it is not necessary.
Among Shi'is, it has become common to say "'Ali is the wali of Allah" during the adhan. There are some narrations indicating that this was said in the presence of the Prophet, for instance, that on the Day of Ghadir Salman al-Farsi recited it during the adhan, and the Prophet approved of it.
Similarly, regarding the kalimah, there are narrations in Sunni and Shi'i books connecting endorsement of Imam 'Ali to endorsement of Allah and the Prophet. For instance, it is said that it is written on the Throne of God: "There is no God but Allah, Muhammad is My servant and messenger, and 'Ali was his supporter."
Sadly, today, some Muslims attack each other over very small details of practice. They dislike some things because they are different from the Islam they are familiar with, or because they are symbolic of a different sect. It would be better to move towards a spirit of tolerance and acknolwedge that there are multiple ways in which Islam is lived today. After all, even if two people are reciting the adhan differently, they are still reciting the adhan. There are many people who don't care about God at all. Why not focus on the big things such as discussing the existence and relevance of God, rather than focusing on small details and trying to "prove" who is right?
(This is not directed at you personally since I am sure it is a genuine question, and it is a good question to ask and know about, but rather it is an overall comment regarding the situation of the Muslim world today and the types of arguments that are had over how to do wudhu and so forth.)
No need to recite the Kalimah of Islam ( I bear witness that there is no God but Allah and Muhammad is His Messenger) in front of witnesses. The person must believe in Islam in his heart and accept Islam as his religion. He will be then a Muslim.
Reciting the Kalimah in front of others is good but not necessary condition to become a Muslim. Even if some one believes in Islam between himself and Allah, with out informing any one else, is a Muslim.
as salam alaikum
the phrase "Aliyyun waliyullah" can be explained in the light the following Qur'anic verse: "Behold! The awliya' of Allah neither fear shall overwhelm them, nor shall they remain in grief" (10:62). A faithful person who have sincerely studied the life of Ali, peace be upon him, will find no problem to count him among the most outstanding examples of those awliya' mentioned in the ayah.
The above-mentioned sentence however is not a part of the tashahhud that can be said during prayers and we don't have any authentic chain of transmission to validate such claim. The salat is an act of worship and we should not add any wording to Islamic worship that has not been prescribed by the Almighty. The believer should be satisfied with what Allah has given him and avoid to exceed His boundaries.
Furthermore, among the acts which invalidates the salat is to speak while praying, unless we are pronouncing Qur'anic verses or specific du'as (like in the case of qunut). The phrase is not as such, rather it is a testimony (which many Shia Muslims add verbally to their shahadah) and an acknowledgement of faith: therefore it is considered "additional talk".
It is necessary in this regard to stick to what has been transmitted to us via mutawatir chains of transmission or, at least, through authenticated reports.
With prayers for your success.
Tashahhud is an obligatory part of Prayers we are been ordered to perform Prayers exactly as the Prophet (SAWA) performed صلوا كما رأيتموني أصلي
We are not allowed to add on obligatory Tashahhud any word.
Tashahhud contains mentioning Imam Ali (AS) and all the Infallible Ahlul Bayt (AS) in saying ALLAHUMMA SALLI ALA MUHAMMADIN WA AALI MUHAMMAD.
It is allowed to recite any Du'a during any part of Prayer (Salah) so it is allowed to say ALLAHUMMA SALLI ALA ALIYYIN AMEERIL MO'MINEN or any supplication like that as Du'a which is not part of Tashahhud.
Our greatest scholars the Maraaje' of Taqleed have said that any deliberate adding to obligatory Tashahhud invalidated the Salah.
I advise you if you are still in doubt to seek the Fatwa of the Marje' of Taqleed.
In Shahadah , we recite ASHHADU ALLA ILAAHA ILLALLAH WAHDAHU LAA SHAREEKA LAH, WA ASHHADU ANNA MUHAMMADAN ABDUHO WA RASOOLOH.