(O mankind! Lo! We have created you male and female…) [49:13]. Said Ibn 'Abbas: “This was revealed about Thabit ibn Qays when he made a remark about the man who did not make room for him to sit: 'What, the son of so-and-so [referring to his mother]'. The Messenger of Allah, Allah bless him and give him peace, said: 'Who mentioned that woman?' Thabit stood up and said: 'I did, O Messenger of Allah!' The Messenger said to him: 'Look at the faces of those present'. And when he looked, he asked him: 'What do you see?' He said: 'I see white, red and black people'. The Prophet said: 'Well, you are not better than any of them unless it be through [the good practice of] religion and God-fearingness'. Allah, exalted is He, then revealed this verse”. Muqatil said: “On the day Mecca was conquered, the Messenger of Allah, Allah bless him and give him peace, ordered Bilal to climb on the roof of the Ka'bah and perform the call to prayer. 'Attab ibn Asid commented on this: 'Praise be to Allah, that Allah has taken my father to Him and made that he did not see this day'. Al-Harith ibn Hisham said: 'Did Muhammad not find any other caller to prayer except this black raven?' Suhayl ibn 'Amr said: 'Allah willing, he will change him'. Abu Sufyan, on the other hand, said: 'I am not going to make any comment; I am afraid that the Lord of heaven will divulge what I say!' Gabriel, peace be upon him, went to the Prophet, Allah bless him and give him peace, and informed him about what they said. The Prophet summoned them and asked them about what they said and they admitted it. Allah, exalted is He, then revealed this verse warning them against boasting about their lineages and abundance of wealth and against looking down on the poor”. Abu Hassan al-Muzakki informed us> Harun ibn Muhammad al-Istrabadhi> Abu Muhammad Ishaq ibn Muhammad al-Khuza'i> Abu'l-Walid al-Azraqi> his grandfather> 'Abd al-Jabbar ibn al-Ward al-Makki> Ibn Abi Mulaykah who said: “On the day Mecca was conquered, Bilal climbed on the roof of the Ka'bah and performed the call to prayer. One person said: 'O servants of Allah! How can this black slave be allowed to perform the call to prayer on top of the Ka'bah?' Another man said: 'If Allah is displeased, He will change him'.
Asbab Al-Nuzul by Al-Wahidi , trans. Mokrane Guezzou