The Cow 2:207. Juz 2, page 32.
وَمِنَ ٱلنَّاسِ مَن يَشْرِى نَفْسَهُ ٱبْتِغَآءَ مَرْضَاتِ ٱللَّهِ ۗ وَٱللَّهُ رَءُوفٌۢ بِٱلْعِبَادِ٢٠٧And of mankind is he who would sell himself, seeking the pleasure of Allah; and Allah hath compassion on (His) bondmen.
Al-Baqarah 2:207, translated by Marmaduke Pickthall