Differing grades
Sunan Ibn Majah 2444
“I heard 'Utbah bin Nuddar say: 'We were with the Messenger of Allah (ﷺ) and he recited Ta-Sin. When he reached the story of Musa, he said: 'Musa (A.S) hired himself out for eight years, or ten, in return for his chastity and food in his stomach.' ”
" إِنَّ مُوسَى صلى الله عليه وسلم أَجَّرَ نَفْسَهُ ثَمَانِيَ سِنِينَ أَوْ عَشْرًا عَلَى عِفَّةِ فَرْجِهِ وَطَعَامِ بَطْنِهِ "