What is the truth behind the statement that Pharaoh's corpse was divinely preserved and mummified as a miracle, based on the Almighty's saying: "So this day We shall save you in your body, that you may be to those who succeed you a sign"?

It was previously mentioned in Fatwa no. 107936 that prayer behind a person who lets his garment hang below the ankles is valid, and the sin is on the person who lets his garment hang alone, unless his belief is infidel. This is based on the Prophet's (peace be upon him) saying: "Pray behind every righteous and wicked person." Narrated by Al-Daraqutni and Al-Bayhaqi, and graded as hasan by Al-Albani.