The Hand of Musa turning White without any Disease

This is the second sign of Musa. That is Allah has commanded him to place his hand into the opening of his garment, as is clearly stated in another Ayah. It mentioned here merely as a passing reference, saying:

وَاضْمُمْ يَدَكَ إِلَى جَنَاحِكَ

The fourth prayer was وَاجْعَل لِّي وَزِيرً‌ا مِّنْ أَهْلِي (and make for me an assistant from my own family - 20:29). The first three prayers of Sayyidna Musa (علیہ السلام) concerned his own person. This fourth prayer relates to the assembling of means which would facilitate the successful completion of his mission, and the most important among these was the appointment of a deputy or a helper, who would assist him in this task. The literal meaning of the word j is "one who carries a burden", and since a minister of a state carries the burden of responsibilities entrusted to him by the ruler, he is called a minister. This shows the extreme foresight and prudence of Sayyidna Musa (علیہ السلام) because the success of any movement or enterprise depends on the selection of competent and dedicated supporters. With good and loyal workers it is easy to surmount all obstacles and hurdles, while with irresponsible and indifferent workers the best preparations and arrangements become futile. If one were to examine the causes of the decline of some of the modern states and the evils from which they suffer, they can all be attributed to the irresponsible conduct, mismanagement and incompetence of the ministers and advisers.

It is related from the Holy Prophet ﷺ that when Allah Ta` ala appoints someone to govern a country and wishes that the country should be well administered, He provides the ruler with a good Wazir to assist him in whatever he does, and if he forgets to attend to some important task, the Wazir is quick to remind him and to help him in what he intends to do. (Nisa'i, from Qasim Ibn Muhammad).