Say, "Whatever reward I have asked of you," meaning: that which I have asked of you as a reward, "it is for you. My reward is only upon Allah."
﴿قُلْ مَا سَأَلْتُكُمْ مِنْ أَجْرٍ﴾ أَي: الَّذِي سألتكم من أجرٍ ﴿فَهُوَ لكم إِن أجري﴾ ثوابي ﴿إِلا عَلَى اللَّهِ﴾