(Lo! Allah hath bought from the believers their lives and their wealth because the Garden will be theirs…) [9:111].
Muhammad ibn Ka‘b al-Qurazi said: “When the Helpers — seventy in number — swore allegiance to the Messenger of Allah, Allah bless him and give him peace, at al-‘Aqabah in Mecca, ‘Abd Allah ibn Rawahah said: ‘O Messenger of Allah, stipulate anything you wish with regard to your Lord and to yourself’. He said: ‘As for my Lord, I stipulate that you worship Him and not associate anything with him; and I stipulate for myself that you defend me from that which you would defend yourselves’. They said: ‘What do we get if we were to do this?’ He said: ‘The Garden!’ they exclaimed: ‘This is a prosperous transaction; we will not revoke it nor will we resign it’. And so this verse was revealed”.
Asbab Al-Nuzul by Al-Wahidi , trans. Mokrane Guezzou