At-Tur - 52:40

أَمْ تَسْأَلُهُمْ أَجْرًا فَهُم مِّن مَّغْرَمٍ مُّثْقَلُونَ
[52:40]
Or do you ask them for a reward, so that they are overburdened by a debt?
Or is it that thou dost ask for a reward, so that they are burdened with a load of debt?-
Or askest thou (Muhammad) a fee from them so that they are plunged in debt?