﴿ أَمْ تَسْـَٔلُهُمْ أَجْرًۭا فَهُم مِّن مَّغْرَمٍۢ مُّثْقَلُونَ ﴾

“Or is it that [they who reject thy message, O Muhammad, fear lest] thou ask of them a reward, so that they would be burdened with debt [if they should listen to thee]?”

Please check ayah 52:43 for complete tafsir.