Volume 5, Book 58, Number 251:
Narrated Ibn Umar:
Umar bin Al-Khattab fixed a grant of 4000 (Dirhams) for every Early Emigrant (i.e. Muhajir) and
fixed a grant of 3500 (Dirhams) only for Ibn ‘Umar. Somebody said to ‘Umar, “Ibn ‘Umar is also one
of the Early Emigrants; why do you give him less than four-thousand?” ‘Umar replied, “His parents
took him with them when they migrated, so he was not like the one who had migrated by himself.