Translation of the verse 3 from Surah An-Naba’ : Number of verses 40 - - page 582 - Part 30.
About which they are in disagreement.
That over which they are in disagreement.
(78:3) that they are in utter disagreement? *1
*1) "The Great News": the news of the Resurrection and Hereafter, which the people of Makkah heard with amazement, then raised questions and doubts about it in their assemblies. When they met each other they would ask: "Did you ever hear that the dead will be resurrected to life? Is it credible that life will be infused once again into the bones which have decayed and become rotten? Does it stand to reason that the former and the latter generations will rise up and gather together at one place? Is it possible that these huge mountains which are so firmly set in the earth will fly about like flakes of wool? Can it so happen that the sun and the moon and the stars should be extinguished and the order and system of the world be overturned and upset? What has happened to him who was until yesterday a sane and wise man among us? Today he is giving us strange, impossible news. Where were this Hell and Heaven of which we had never heard from him before? wherefrom have they appeared suddenly so that he has started depicting them so vividly before us?" Another meaning of fi-hi mukhtalifun also can be: "As these people themselves are not agreed on any one view about the end of fhe world, they hold varying views about it." Some one has been influenced by the Christian belief and believes in the life after death but thinks that the second life would not be a physical but only a spiritual life. Another does not deny the Hereafter absolutely but doubts whether it was possible or not. The Qur'an relates the view of these very people when it says: "We do only guess: we are not certain." (AI-Jathiyah: 32). And another plainly said: "There is no other life than this present life, and we shall never be raised back to life after our death." (Al-An`am: 29). Then, there were some atheists, who said: "Life is only this worldly life of ours. Here we shall die and live and nothing but the change of time destroys us." (AI-Jathiyah: 24). There were some others who were not atheistic but they regarded the second life as impossible. According to them it was beyond the power of God to raise the dead back to life. They said, "Who will give life to these bones when they are rotten." (Ya Sin: 78). Their different views by themselves were a proof that they had no knowledge in this regard; they were only conjecturing and guessing. Had they any knowledge they would have agreed on ane view. (For further explanation, see E.N. 6 of Surah Adh-Dhariyat).
Source : An-Naba’ Verse 3: That over which they are in disagreement.