COMMENTARY on 52:40
A. Yusuf Ali:

Translation:
Or is it that you do ask for a reward, 5074 so that they are burdened with a load of debt?-
Commentary:

5074  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? (Cf. n. 5627).