Quran 33.22-23
And when the true believers saw the clans, they said: This is that which Allah and His messenger promised us. Allah and His messenger are true. It did but confirm them in their faith and resignation. Of the believers are men who are true to that which they covenanted with Allah. Some of them have paid their vow by death (in battle), and some of them still are waiting; and they have not altered in the least;