Salams. Can you please give me the biography of Abdullah bin umar? Who was he and what authority in Islam? jazak Allah khair.

All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad, sallallaahu ‘alayhi wa sallam, is His slave and Messenger.

‘Abdullaah ibn ‘Umar ibn Al-Khattaab ibn ‘Abdul ‘Uzza Abu Abdur-Rahmaan Al-Qurashi Al-‘Adawi Al-Makki, the Meccan and later the Madenite, was among the learned Companions. He converted to Islam at a very young age and then migrated with his father before reaching the age of puberty. He was deemed too young to fight during the Battle of Uhud, so his first battle was Al-Khandaq (the Trench). He was among those who pledged allegiance to the Prophet, sallallaahu ‘alayhi wa sallam, under the tree. His mother was Zaynab bint Math‘oon.

He related much knowledge from the Prophet, sallallaahu ‘alayhi wa sallam, and from his father 'Umar, Abu Bakr and ‘Uthmaan, as well as from many senior Companions .

Reputable Successors (Taabi‘oon), such as Sa‘eed ibn Al-Musayyib, Thaabit Al-Bunaani, Taawoos, Az-Zuhri, Muhammad ibn Seereen, Naafi‘ (his servant), Mujaahid, and others, were among those who related from him.

‘Abdullaah ibn ‘Umar ibn Al-Khattaab was known for his asceticism, virtuousness, generosity, spending in Allaah's cause, knowledge and piety, and for his strong desire to exemplify the Prophet, sallallaahu ‘alayhi wa sallam, and follow his tracks in even the most subtle matters. He was also known for abundant worship, such as praying at night and fasting during the day, and performing Hajj every year.

This is a brief overview about his life, his status in Islam and his virtues.

Allaah Knows best.