There is no re birth but resurrections or return to this life which known as Raj'ah رجعة.
Raj'ah is the return of best servants of Allah and worst enemies of Allah to this life again to witness the victory of Islam and the punishment of its enemies. It is mentioned in Quran ( Sura Ghaafir, verse 11).
Imam Hussain (AS) will come back to this life in Raj'ah.
Main changes in Salaah were done during the rule of Omar ibn Al-Khattab. There are hundreds of narrations even in Sunni books about these changes initiated by Omar. You can see Al-Nass WAL-Ijtihad by Allama Sharafuddin and also Kitab Al-Waa'il which is a Sunni book by Abu 'Oroobah, stating who initiated what among Muslims.
Wassalam.
There is a full field of knowledge called E'lm Al-Rijaal which deals with every narrator and searching and assessing his authenticity. Deviat persons are known by our scholars of E'lm Al-Rijaal and their narrations are never accepted.
Famous Shia books on E'lm Al-Rijaal are like Kitab Al-Rijaal by Al-Najaashi (450 Hijri),
Rijaal Al-Kashshi (350 Hijri) ,
and Al-Fahrist by Al-Shaikh Al-Tousi (460 Hijri) ,
Ma'aalim Al-Ulama' by Ibn Sharashoob 588 hijri.
Khulasat Al Awwal by Al-Allama Al-Hilli 726 hujri.
Tanqeeh Al-Maqaal by Al-Mamaqani 1351 hujri.
and Mu'jam Rijaal Al-Hadeeth by Al-Khoei 1413 hijri.
We only accept narrations from authentic narrators who were always in the right path.
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