Between Musa, peace be upon him, and the Sorcerers Allah describes the actual encounter between Musa, peace be upon him,and the Egyptians in Surat Al-A` raf, Surah Ta Ha, and in this Surah

The Egyptians wanted to extinguish the Light of Allah with their words, but Allah insisted that His Light should prevail even though the disbelievers disliked that. This is the issue of disbelief and faith; they never confront one another but faith always prevails:

بَلْ نَقْذِفُ بِالْحَقِّ عَلَى الْبَـطِلِ فَيَدْمَغُهُ فَإِذَا هُوَ زَاهِقٌ وَلَكُمُ الْوَيْلُ مِمَّا تَصِفُونَ

بِعِزَّةِ فِرْ‌عَوْنَ (By the majesty of the Pharaoh - 26:44). This was an expression of pledge from the magicians, which was in vogue in the olden times. It is unfortunate that similar oaths have now become common among the Muslims as well, which are even more evil and vile, for instance, 'by the king,' 'by the head of yours,' 'by the beard of yours,' 'by the grave of your father' etc. It is not permitted to make an oath of this nature under the Islamic law (because swearing in the name of someone other than Allah is a sin). Rather, it will not be wrong to say that swearing a true oath in this way is as much sinful as swearing a false oath in the name of Allah. (Ruh)