Is the Quran a book full of contradictions and errors, and if Allah says: (And if it were from [any other] than Allah, they would have found within it much contradiction), then how does it mention the drowning of Pharaoh in Surat Ash-Shu'ara, yet stipulate the salvation of his body in Surat Yunus?

The Holy Qur'an is free from discrepancies and contradictions, and Allah has guaranteed its preservation. The doubts raised are due to a lack of contemplation, not a flaw in the Qur'an. The defect lies in the understanding of the objector, not in the conclusive verses. Contemplating the Qur'an necessitates certainty that it is truth and righteousness. What appears to be a discrepancy is a "compatible variation" resulting from a difference in circumstance, time, or person, such as the different stages of Adam's creation, peace be upon him. As for the story of Pharaoh's drowning, Allah's saying, "So today We will save you in your body," means saving the body from loss, not saving him from death, so that he may be a sign and a lesson for the Children of Israel.