THE SHIA DID NOT BELIEVE IN THE INFALLIBILITY OF THEIR IMAMS.(proofs from shia books)
The renowned Shia scholar of Hadith al-Shaheed al-Thani says in his book "Haqaeq al-Iman" pages
150-152:
"What is apparent from the condition of their Shia who
lived in their time and narrated from them the Ahadeeth
may peace be upon them, that MANY OF THEM did not
believe in their infallibility because it was hidden from
them but they used to believe that the Imams were
pious obedient scholars, anyone who follows their
stories and narrations knows this"
after a few lines he says:
"How!? they were hidden and isolated at all times and
they practised taqiyyah most of the time, so they
couldn't tell even their closest followers about their
Imamah let alone the others, the books of Rijal and the
Ahadeeth are proof of this"
ﻗﺎﻝ ﺍﻟﻤﺎﻣﻘﺎﻧﻲ ﻓﻲ ﻛﺘﺎﺑﻪ ( ﺗﻨﻘﻴﺢ ﺍﻟﻤﻘﺎﻝ ) 6 / 340 : ﻟﻜﻦ ﻗﻮﻝ
ﺍﺑﻦ ﺍﻟﻐﻀﺎﺋﺮﻱ ﻳﻮﻫﻢ ﻗﺒﻮﻝ ﺭﻭﺍﻳﺘﻪ ﺗﺎﺭﺓ ، ﻭﻻ ﻳﺒﻌﺪ ﺃﻧّﻬﻢ ﻛﺎﻧﻮﺍ
ﻳﻘﺒﻠﻮﻥ ﺭﻭﺍﻳﺎﺗﻪ ﺍﻟﺨﺎﻟﻴﺔ ﻣﻦ ﺍﻟﻐﻠﻮّ ﻭﻳﺘﺮﻛﻮﻥ ﻣﺎ ﻛﺎﻥ ﻓﻴﻪ ﻏﻠﻮّ.
ﻭﺣﻴﺚ ﺇﻥّ ﺍﻟﻐﻠﻮّ ﻋﻨﺪ ﺍﻟﻘﺪﻣﺎﺀ ﻳﻨﺴﺐ ﺇﻟﻰ ﺍﻟﺮﺟﻞ ﺑﺄﺩﻧﻰ ﺷﻲﺀ ،
ﺑﻞ ﺃﻛﺜﺮ ﻣﺎ ﻧﻌﺘﻘﺪﻩ ﺍﻵﻥ ﻓﻲ ﺃﻫﻞ ﺍﻟﺒﻴﺖ ﻋﻠﻴﻬﻢ ﺍﻟﺴﻼﻡ ﻛﺎﻧﻮﺍ
ﻳﻮﻣﺌﺬ ﻳﺴﻤّﻮﻧﻪ ﻏﻠﻮّﺍً . ﺃ. ﻫــ
Shia scholar al-Mamaqani says in his book "Tanqeeh
al-Maqal" volume 6 page 340:
"Our predecessors used to ascribe Ghulu to the
smallest things, in fact the majority of the things we
believe in today regarding Ahlul-Bayt peace be upon
them used to be called Ghulu by our predecessors."