ثُعْبَانٌ مُّبِينٌ
(a Thu`ban serpent, manifest), refers to "The male snake." As-Suddi and Ad-Dahhak said similarly. A report from Ibn `Abbas said,
فَأَلْقَى عَصَاهُ
"(Then (Musa) threw his staff), and it turned into a huge snake that opened its mouth and rushed towards Fir`awn. When Fir`awn saw the snake rushing towards him, he jumped from his throne and cried to Musa for help, so that Musa would remove the snake from his way. Musa did that." As-Suddi commented,
فَإِذَا هِىَ ثُعْبَانٌ مُّبِينٌ
(and behold! It was a Thu`ban serpent, manifest!) "This Thu`ban refers to male snakes. The snake opened its mouth and headed towards Fir`awn to swallow him, placing its lower jaw on the ground and its upper jaw reaching the (top of the) wall of the palace. When Fir`awn saw the snake, he was frightened, so he jumped and wet himself and he never wet himself before this incident. He cried, `O Musa! Take it away and I will believe in you and release the Children of Israel to you.' So Musa, peace be on him, took it, and it became a staff again. "
وَنَزَعَ يَدَهُ فَإِذَا هِىَ بَيْضَآءُ لِلنَّـظِرِينَ
(And he drew out his hand, and behold! it was white (with radiance) for the beholders.) Musa took his hand out of his cloak after he inserted his hand in it and it was shining, not because of leprosy or sickness. Allah said in another Ayah,
وَأَدْخِلْ يَدَكَ فِى جَيْبِكَ تَخْرُجْ بَيْضَآءَ مِنْ غَيْرِ سُوءٍ
(And put your hand into your bosom, it will come forth white without hurt.) 27:12 Ibn `Abbas said, "without hurt', means, `not because of leprosy'. Musa inserted his hand again in his sleeve and it returned back to its normal color." Mujahid and several others said similarly.
Ma'arif al-Qur'an
Mufti Muhammad Shafi
The prophet Musa (علیہ السلام) in response to his demand, threw down his staff on the earth, instantly it turned into a serpent: فَإِذَا هِيَ ثُعْبَانٌ مُّبِينٌ. The word 'thu` ban' in Arabic signifies a huge serpent. The use of the word 'mubin' as an adjective which means 'clear or prominent' is quite descriptive of the fact that this miraculous event took place manifestly before the eyes of the people of the Pharaoh, and it was not performed secretly in a hidden or secluded place as is usually done by magicians. In some historical traditions it has been cited on the authority of the Companion Ibn ` Abbas ؓ that as the serpent moved towards Pharaoh, he jumped from his throne and sought shelter near the prophet Musa (علیہ السلام) and many of his courtiers died of extreme fear. (Tafsir Kabir)
Transformation of the staff into a real serpent is not, in fact, totally impossible as it apparently seems. It is, however, surprising due to being unusual. The miracle has to be an unusual act, beyond the power of a common individual. Allah shows the miracles through His prophets to make people understand that they possess some divine powers and are true prophets of Allah.
God has blessed man with the powers of observation, hearing and thinking, so that he may learn lessons and, with their help, may understand the signs of God. But when a man does not utilize these powers for the purpose for which they were intended, then it inevitably happens that the sensitivity of his heart starts waning until his feelings become blunted; the seal of insensitivity is thus fixed on his heart and mind. Now, his position becomes that of one who does not see in spite of having eyes, does not hear in spite of having ears and does not understand in spite of having a mind; and in spite of being a human being, he loses his humanity. The human race began with the followers of Adam. Thereafter, when they fell into wrong ways, the prophets of God came to admonish them. Now those who reformed themselves on the advent of the prophets were saved and those who refused to be reformed were destroyed. Again the following generations forgot the vows of submission to God made to their prophets, and they suffered the same consequences as those of the later generations of Adam’s followers. Such a state of affairs has occurred again and again, so much so that the history of the greater part of the human race has become that of disobedience and the breaking of pledges.
Uthmani text of the Madinah mushaf (King Fahd Complex). Translation: Saheeh International. Tafsir via Quran.com.