Regarding the Verse: "Verily! The worst of beasts in the Sight of Allah are the deaf and the dumb---- those who understand not." (8.22) (The people referred to here) were some persons from the tribe of Bani `Abd-Addar.
Sahih al-Bukhari Book 65, Hadith 168
← Previous Hadith I asked Ibn `Abbas regarding Surat-al-Anfal. He said, "It was revealed in connection with the Battle of Badr."

Sahih al-Bukhari Book 65, Hadith 167 Next Hadith → While I was praying, Allah's Messenger (ﷺ) passed me and called me, but I did not go to him until I had finished the prayer. Then I went to him, and he said, "What prevented you from coming to me? Didn't Allah say:-- "O you who believe! Answer the call of Allah (by obeying Him) and His Apostle when He calls you?" He then said, "I will inform you of the greatest Sura in the Qur'an before I leave (the mosque)." When Allah's Messenger (ﷺ) got ready to leave (the mosque), I reminded him. He said, "It is: 'Praise be to Allah, the Lord of the worlds.' (i.e. Surat-al-Fatiha) As-sab'a Al-Mathani (the seven repeatedly recited Verses).

Sahih al-Bukhari Book 65, Hadith 169