سورة الأعراف

Imam Baqir (peace be upon him): Allah the Exalted sent the twelve Asbat (tribes) after Yusuf, then He sent Musa (peace be upon him) and Harun (peace be upon him) to Firawn and his followers in Egypt, and he was sent only to them.

Imam Ali, Amir al-Mu'minin (peace be upon him), in the Sermon of Qasi'a said: "Indeed Allah the Glorified tests His arrogant servants through His friends who are weak in their eyes. When Musa ibn Imran and his brother Harun (peace be upon them) came in upon Pharaoh, they were wearing woollen garments and had staffs in their hands, and they stipulated with Pharaoh that if he submitted to the Lord, his rule and kingdom would remain forever and his glory would endure. Pharaoh said: 'Do you not wonder at these two, who tie the permanence of my glory and the everlastingness of my kingdom to their own demands, while they live in poverty and destitution? If it is so, why do they not have bracelets of gold with them?' Pharaoh said this to magnify gold and to belittle a garment of wool. Yet if Allah the Glorified had willed, at the time of raising the prophets, He would have opened before them the doors of treasures, the mines of jewels, and green gardens, and He would have set the birds of the sky and the wild beasts of the earth in motion along with them. But had He done so, trial would have vanished, reward and punishment would have become ineffective, and the glad tidings and warnings of Allah would have been futile, and the reward of those tested would not have been due upon the believers, and those who believed would not have obtained the reward of the righteous."