What is Naskh or al-naskh and how can it be explained in simple terms? Naskh means abrogation - i.e., change or repeal. Naskh is the right to change or repeal God's previously given revelations that God supposedly gave to Muhammad. Over 220 surah in the Quran are abrogated by naskh.
Muhammad justified naskh with this surah in the Quran: "We do not abrogate a surah or cause it to be forgotten except that We bring forth [one] better than it or similar to it. Do you not know that Allah is over all things competent?" - Quran 2:106
Allah is not the God of the Bible. Allah is the pagan moon god of ancient Arabia that Muslims claim is the God of the Bible. This claim is false (see Allah Moon God).
If Muhammad were referring to the God of the Bible, the question arises, 'Does God, who is perfect, need to change, repeal or "better" His own words even once, let alone over 220 times in the life of one self-declared prophet?' (see Prophet Isa).
In reality, naskh is a convenient but dubious excuse Muhammad made up in order to cover up the myriad errors in the Quran, changes his mind, and on at least three occasions, justify his sexual appetite. For example, Muhammad initially limited all men to each have a maximum of four wives (above):
"And if you fear that you will not deal justly with the orphan girls, then marry those that please you of [other] women, two or three or four. But if you fear that you will not be just, then [marry only] one or those your right hand possesses. That is more suitable that you may not incline [to injustice]." - Quran 4:3
Naskh of the passage above with the one below granted Muhammad the sole privilege to take as many wives as he wanted (see Muhammad False Prophet):
"O Prophet, indeed We have made lawful to you your wives to whom you have given their due compensation and those your right hand possesses from what Allah has returned to you [of captives] and the daughters of your paternal uncles and the daughters of your paternal aunts and the daughters of your maternal uncles and the daughters of your maternal aunts who emigrated with you and a believing woman if she gives herself to the Prophet [and] if the Prophet wishes to marry her, [this is] only for you, excluding the [other] believers. We certainly know what We have made obligatory upon them concerning their wives and those their right hands possess, [but this is for you] in order that there will be upon you no discomfort. And ever is Allah Forgiving and Merciful." - Quran 33:50