Amir bin Abi Waqqas (r.a.)
Hz. Amir was the brother of Sa'd bin Abi Waqqas, who was one of the ten Companions who were given the glad tiding of Paradise. He became a Muslim in the first years of Islam through Hz. Sa'd. His mother was disturbed when he became a Muslim as she did when Sa'd became a Muslim. She vowed that she would not sit in the shade, not to eat and drink anything unless he left his religion. Amir was very young at that time but he had a strong belief. He did not pay attention to these words of his mother’s because his mother had done the same thing for his older brother Sa'd before. Sa'd did not obey his mother and did not make any concessions about his belief though he respected his mother. Thereupon, the verse stating that it was not permissible to obey a person even if it was one’s mother or father if it necessitated disobedience to Allah was sent down. Knowing this, Hz. Amir did not obey his mother.
However, his mother disturbed Amir a lot. Hz. Amir could not bear it any more; he migrated to Abyssinia. Then, he migrated to Madinah, receiving two thawabs of migration.
Amir, who participated in the Battle of Uhud passed away during the caliphate of Hz. Umar in Damascus. 
Tabaqat, 4: 123.