Question Summary:
Which prophet or sahabi was in his mothers womb for four years?

Question Detail:

Which prophet or sahabi was in his mothers womb for four years?

Answer :

In the Name of Allah, the Most Gracious, the Most Merciful.
As-salāmu ‘alaykum wa-rahmatullāhi wa-barakātuh.
It is reported that Muhammad Bin Abdullah Bin Hasan Bin Hasan Bin Ali Bin Abi Talib (Rahimahu Allah) remained in his mother’s womb for four years. However, he was not a Sahabi or a prophet.[1]
And Allah Ta’āla Knows Best
Zakariya Memon
Student Darul Iftaa
Chatham, Canada 
Checked and Approved by,
Mufti Ebrahim Desai.
Daruliftaa.net