Quran Al-Baqarah 2:207
وَمِنَ ٱلنَّاسِ مَن يَشۡرِي نَفۡسَهُ ٱبۡتِغَآءَ مَرۡضَاتِ ٱللَّهِۚ وَٱللَّهُ رَءُوفُۢ بِٱلۡعِبَادِ ٢٠٧
Translation
And of the people is he who sells himself, seeking means to the approval of Allāh. And Allāh is Kind to [His] servants.