Tafsir Ibn Kathir (abridged)
Fir`awn's Address to His People and how Allah punished Him
Allah tells us how Fir`awn stubbornly persisted in his rebellion and disbelief. He assembled his people and addressed them in a vainglorious fashion, boasting of his dominion over Egypt.
أَلَيْسَ لِى مُلْكُ مِصْرَ وَهَـذِهِ الاٌّنْهَـرُ تَجْرِى مِن تَحْتِى
(Is not mine the dominion of Egypt, and these rivers flowing underneath me) Qatadah said, "They had gardens and rivers of flowing water."
أَفلاَ تُبْصِرُونَ
(See you not then) means, `do you not see my position of might and power' -- implying that Musa and his followers were poor and weak. This is like the Ayah:
فَحَشَرَ فَنَادَى - فَقَالَ أَنَاْ رَبُّكُمُ الاٌّعْلَى - فَأَخَذَهُ اللَّهُ نَكَالَ الاٌّخِرَةِ وَالاٍّوْلَى
Continue reading the tafsir of ayahs 51–56