Jesus helps us to understand the relationship between master and slave. Once he spoke to his disciples about a slave who came home after working through the day.
فَذَاتَ مَرَّةٍ ،‏ أَخْبَرَ تَلَامِيذَهُ عَنْ عَبْدٍ عَادَ إِلَى ٱلْمَنْزِلِ بَعْدَ يَوْمٍ مِنَ ٱلْعَمَلِ ٱلشَّاقِّ .‏