Ibn Umm-Maktum was a cousin of Khadijah bint Khuwaylid, Muhammad's first wife.
Muhammad sent him and Mus`ab ibn `Umair to Medina for teaching Qur'an to the inhabitants before the Hijra took place.
[3] Abdullah Ibn Umm-Maktum requested Umar, the second Caliph of Islam, to let him take part in Jihad in spite of his blindness.
According to traditional Sunni narration, the story behind the revelation of the first ten verses of Abasa is as follows :[4][5] Muhammad was preaching Islam to Walid ibn al-Mughira and other Quraysh chieftains in Mecca.
Muhammad did not want to turn his attention away from the chieftains and frowned at ibn Umm Maktum.