Sura al-Qaṣaṣ 28:27

قَالَ إِنِّىٓ أُرِيدُ أَنْ أُنكِحَكَ إِحْدَى ٱبْنَتَىَّ هَٰتَيْنِ عَلَىٰٓ أَن تَأْجُرَنِى ثَمَٰنِىَ حِجَجٍ فَإِنْ أَتْمَمْتَ عَشْرًا فَمِنْ عِندِكَ وَمَآ أُرِيدُ أَنْ أَشُقَّ عَلَيْكَ سَتَجِدُنِىٓ إِن شَآءَ ٱللَّـهُ مِنَ ٱلصَّٰلِحِينَ

qalā innī urīdu an unkiḥaka iḥda bnataya hātayni ʿala an taʾjuranī thamāniya ḥijajin fa-in atmamta ʿashran famin ʿindika wa-mā urīdu an ashuqqa ʿalayka sa-tajidunī in shāʾa allāhu mina l-ṣāliḥīna

He said: "I intend to wed one of these my daughters to thee, on condition that thou serve me for eight years; but if thou complete ten years, it will be (grace) from thee. But I intend not to place thee under a difficulty: thou wilt find me, indeed, if Allah wills, one of the righteous."