The Shias consider 'Ali un wali ullah' to be a part of kalimah, while the fact is that it was never considered a part of kalimah, hence in this article, we shall prove that when the various personalities of Islam embraced Islam, the kalimah they recited included the shahadah that there is no god besides Allah, and the shahada that Muhammad (saww) is the Messenger of Allah. It never included the shahadah that Ali is the wali of Allah. The Shias have wrongly added it to the kalimah, while it was never a part of it. Just because the sun rises from the east, we don't need to add it into the kalimah. Remember that the kalimah on which the ahlus sunnah differ with the Shias is the kalimah which when recited with belief in it is sufficient for a non Muslim to become a Muslim. Now we shall bring forth our evidences
Evidence # 1
"Narjis (in the dream) told Fatima (may Allah be pleased with her) that Imam Hasan Askari doesn't come to meeet me. Fatima (may Allah be pleased with her) said "How can he come you when you commit shirk. If you want that Allah and Jesus and Mary be happy with you, and Hasan Askari come to meet you, Then say "I testify that there is no god but Allah and Muhammad (peace be upon him) is the Messenger of Allah. When I said these two kalimah, Fatima (may Allah be pleased with her) embraced me and told me that soon Hasan Askari will come to meet you. Than I woke up and kept reciting this Kalimah. Second night when I slept, I saw Hasan Askari in my dream. I told him, why have you come so late. He said "Because you were Mushrika before, now you have embraced Islam, so I will come every night"
Hence, even after the death of Ali (may Allah be pleased with him) , the kalimah of the Muslims was the same, and no changes were ever made to it. Indeed Ali (may Allah be pleased with him) is the wali of God, but we can't add things to kalimah like that, or everyone will add his own statements to kalimah, e.g "And I am the servant of God", now these statements are wrong in no ways, but this doesn't mean that we should add them to kalimah.
Evidence # 2
مُحَمَّدُ بْنُ يَحْيَى عَنْ أَحْمَدَ بْنِ مُحَمَّدِ بْنِ عِيسَى عَنِ ابْنِ أَبِي عُمَيْرٍ عَنْ جَمِيلِ بْنِ دَرَّاجٍ قَالَ سَأَلْتُ أَبَا عَبْدِ اللَّهِ ( عليه السلام ) عَنِ الْإِيمَانِ فَقَالَ شَهَادَةُ أَنْ لَا إِلَهَ إِلَّا اللَّهُ وَ أَنَّ مُحَمَّداً رَسُولُ اللَّهِ
Jamil bin Duraj narrates that he asked Abu Abdullah (as) about Iman (faith) , on which he said : The testimony that there is no god besides Allah, and that Muhammad (saww) is the Messenger of Allah.
al Kafi, Vol. 1, p. 55
Majlisi declared it sahih in Miratul Uqul 7/246
Evidence # 3
Abu Dhar (ra) said :
فرفعني إلى بيت فيه علي بن أبي طالب (عليه السلام) فلما دخلت سلمت فرد علي السلام، ثم قال: ما حاجتك؟ قلت: هذا النبي المبعوث فيكم؟ قال: وما حاجتك إليه؟ قلت: أؤمن به وأصدقه، ولا يأمرني بشئ إلا أطعته، قال: تشهد أن لا إله إلا الله، وأن محمدا رسول الله، قال: قلت: أشهد أن لا إله إلا الله وأن محمدا رسول الله
He (i.e Hamza) sent me to Ali ibn Abi talib (alaih salam) so when I went there, I said salaam to him, and he replied me, and inquired : What is your purpose? I said : A prophet has been sent amongst you? He said : What do you need from him? I said: So that I can believe in him and testify about him, and he orders me and I obey him, so he said : Testify that there is no god but Allah, and that there is Muhammad is the Messenger of Allah. So I said : I testify that there is no god but Allah and Muhammad is the Messenger of Allah
Bihar ul Anwar, Vol. 22, p. 422