From the hadith of Ibn ‘Abbas, the Prophet, salah allahu ‘alayhi wa salam, said:
I entered paradise yesterday and I saw what was in it, and there was Ja’far flying with the angels, and Hamza resting on his bed.
[Classifed as Sahih by Al-Albani in Saheeh Al-Jami', 3363]
Ja’far bin Abi Taleb died in the battle of Mu’tah with more than 90 wound marks on his body from swords and arrows. Hamza bin AbdulMutaleb died in the battle of Uhud with his limbs cut off and became the master of martyrs on the day of Judgement.
May Allah be pleased with all the companions of the Prophet, salah allahu ‘alayhi wa salam…