Qur'an 76:9

إِنَّمَا نُطْعِمُكُمْ لِوَجْهِ ٱللَّهِ لَا نُرِيدُ مِنكُمْ جَزَآءً وَلَا شُكُورًا

(Saying): We feed you, for the sake of Allah only. We wish for no reward nor thanks from you;