أَمْ تَسْأَلُهُمْ خَرْجًاOr is it that you ask them for some Kharj,Al-Hasan said,"A reward."Qatadah said,"Some payment."فَخَرَاجُ رَبِّكَ خَيْرٌBut the recompense of your Lord is better,means, you are not asking for any wages or payment or anything for calling them to right guidance, rather you are hoping for a great reward from Allah, as He says:قُلْ مَا سَأَلْتُكُم مِّن أَجْرٍ فَهُوَ لَكُمْ إِنْ أَجْرِىَ إِلاَّ عَلَى اللَّهِSay:"Whatever wage I might have asked of you is yours. My wage is from Allah only." (34:47)قُلْ مَأ أَسْـَلُكُمْ عَلَيْهِ مِنْ أَجْرٍ وَمَأ أَنَأ مِنَ الْمُتَكَلِّفِينَSay:"No wage do I ask of you for this, nor am I one of the pretenders." (38:86)قُل لاَّ أَسْـَلُكُمْ عَلَيْهِ أَجْراً إِلاَّ الْمَوَدَّةَ فِى الْقُرْبَىSay:"No reward do I ask of you for this except to be kind to me for my kinship with you." (42:23)وَجَأءَ مِنْ أَقْصَى الْمَدِينَةِ رَجُلٌ يَسْعَى قَالَ يقَوْمِ اتَّبِعُواْ الْمُرْسَلِينَ اتَّبِعُواْ مَن لاَّ يَسْـَلُكُمْ أَجْراًAnd there came a man running from the farthest part of the town. He said:"O my people! Obey the Messengers. Obey those who ask no wages of you, and who are rightly guided." (35:20-21)وَهُوَ خَيْرُ الرَّازِقِينَand He is the Best of those who give sustenance. وَإِنَّكَ لَتَدْعُوهُمْ إِلَى صِرَاطٍ مُّسْتَقِيمٍ