The Basmala (Arabic: بَسْمَلَة basmalah), also known by its incipit Bi-smi llāhi (Arabic: بِسْمِ ٱللَّٰهِ, "In the name of God"), is the Islamic phrase bi-smi llāhi r-raḥmāni r-raḥīmi (بِسْمِ ٱللَّٰهِ ٱلرَّحْمَٰنِ ٱلرَّحِيمِ) "In the name of God, the Most Gracious, the Most Merciful."
This is the phrase recited before each surah (chapter) of the Qur'an – except for the ninth.
It is used by Muslims in various contexts (for instance, during daily prayer) and is used in over half of the constitutions of countries where Islam is the official religion or more than half of the population follows Islam, usually the first phrase in the preamble, including those of Afghanistan, Bahrain, Bangladesh, Brunei, Egypt, Iran, Iraq, Kuwait, Libya, Maldives, Pakistan, Tunisia, and the United Arab Emirates.In Arabic calligraphy, the Basmala is the most prevalent motif, even more so than the Shahadah.In Unicode, the Basmala is encoded as one ligature at code point U+FDFD ﷽ in the Arabic Presentation Forms-A block.
You need to know in your mind that you will be reciting the specific Sura
like Ikhlas or al-Qadr or any other Sura. You should not say the name of the Sura during your Salah.
It is not obligatory to perform Sajda al-Sahw for unintentionally saying Bismillah in stead of Tasbeehaat Al-Arba'.
All statements and actions of Infallible Imams start with Bismillah, but the people who compiled the sayings and sermons did not mention Bismillah as it is understood for every one.
It is permissible and recommended to say Bismillah on starting any important act including Quran recitation, but you should not say it as a verse when you recite Sura Tawbah because it has no Bismillah Arrahman Arraheem.
To my knowledge, this is not present in the classical, normative Twelver Shi'i hadith collections.
Of course, this doesn't prove whether he said this or not, or whether the statement contains truth or not; it simply means it is not in these books and doesn't have a chain of narrators.
However it is commonly accepted particularly among people who have mystical inclinations ('irfan, Sufism).
In any case, the status of Imam 'Ali is lofty whether or not he said this!
The writing of Quranic words is different from the usual Arabic alphabetical writing. Quranic writing is called Tawqeefiyyah ( توقيفية )which means that it is fixed and unchangeable as the Prophet Muhammad (SAWA) instructed Imam Ali (AS) when he wrote the Quranic text. There are many examples of Quranic words written is a different way from the Arabic Alphabetical words. No doubt, Quran is in Arabic, but the Quranic writing is special and it is called Tawqeefiyyah.