"Or do you ask them for a payment?" meaning: a wage for what you have brought them, for you do not ask them for a wage. "But the bounty of your Lord," meaning: their reward in the Hereafter is better than any wage they might give you in this world, "and He is the best of providers." God may make the provision of His servants through one another; He provides for this person at the hands of that person, and God provides for them, "and He is the best of providers," meaning: the most excellent of them.
﴿أم تَسْأَلهُمْ خرجا﴾ [أَيْ: أَجْرًا عَلَى مَا جِئْتَهُمْ بِهِ، لِأَنَّكَ لَا تَسْأَلُهُمْ أَجْرًا ﴿فخراج رَبك﴾ (ل ٢٢٨) يَعْنِي: ثَوَابُهُمْ فِي الْآخِرَةِ خَيْرٌ من أجرهم أَو أَعْطُوْكَ فِي الدُّنْيَا أَجْرًا ﴿وَهُوَ خير الرازقين﴾ وَقَدْ يَجْعَلُ اللَّهُ رِزْقَ الْعِبَادِ بَعْضِهِمْ مِنْ بَعْضٍ يَرْزُقُ هَذَا عَلَى يَدَيْ هَذَا يَرْزُقُ اللَّهُ إيَّاهُم ﴿وَهُوَ خير الرازقين﴾ يَعْنِي: أفضلهم.