52:40
Or is it that thou dost ask for a reward, so that they are burdened with a load of debt?-
The prophets of Allah ask for no reward to preach the Message of Allah and direct men to the right Path. Why then do men shun them and persecute those who seek to bring blessings to them?
References:
Yusuf Ali, Abdullah. Translation and Commentary of the Quran. (surah 52 verse 40.