﴿ وَرَفَعَ أَبَوَيْهِ عَلَى ٱلْعَرْشِ وَخَرُّوا۟ لَهُۥ سُجَّدًۭا ۖ وَقَالَ يَٰٓأَبَتِ هَٰذَا تَأْوِيلُ رُءْيَٰىَ مِن قَبْلُ قَدْ جَعَلَهَا رَبِّى حَقًّۭا ۖ وَقَدْ أَحْسَنَ بِىٓ إِذْ أَخْرَجَنِى مِنَ ٱلسِّجْنِ وَجَآءَ بِكُم مِّنَ ٱلْبَدْوِ مِنۢ بَعْدِ أَن نَّزَغَ ٱلشَّيْطَٰنُ بَيْنِى وَبَيْنَ إِخْوَتِىٓ ۚ إِنَّ رَبِّى لَطِيفٌۭ لِّمَا يَشَآءُ ۚ إِنَّهُۥ هُوَ ٱلْعَلِيمُ ٱلْحَكِيمُ ﴾

“And he raised his parents to the highest place of honour; and they [all] fell down before Him, prostrating themselves in adoration. Thereupon [Joseph] said: "O my father! This is the real meaning of my dream of long ago, which my Sustainer has made come true. And He was indeed good to me when He freed me from the prison, and [when] He brought you [all unto me] from the desert after Satan had sown discord between me and my brothers. Verily, my Sustainer is unfathomable in [the way He brings about] whatever He wills: verily, He alone is all-knowing, truly wise!”

Here the ‘couch’ does not mean a royal throne but the seat where Joseph used to sit and discharge the duties of his post; here prostration (sajdah) does not mean lying face down in the usual sense but bowing down and kneeling (ruku‘). This form of obeisance to a great man was prevalent in ancient times.