None can dispute about the Signs of Allah but the Unbelievers. Let not, then, their strutting about through the land deceive thee!
In verse 4, it was said: (No one quarrels
about the verses of Allah, except those who disbelieve.). This verse
declares quarreling in the matter of the Qur’an an act of kufr (disbelief).
And the Holy Prophet (S) has said: (Surely, quarreling (jidal) in the Qur’an is kufr.’ (Reported by al-Baghawi, al-Baihaql in ash-Shu’ab from Sayyidna Abu Hurairah (RA); and reported by Abu Dawud and al-Hakim who has
rated it as ‘Sahih- Mazhari)
It appears in Hadith that, on a certain day, the Holy Prophet (S)
heard two persons quarreling about some verse of the Qur’an. He got
angry, and came out with his blessed face showing the signs of anger. He
said, ‘communities before you were ruined because they had started
quarreling in the matter of the Book of Allah.’ (Reported by Muslim from
‘Abdullah Ibn ‘Amr Ibn Shu’aib – Mazhari)
This (jidal) declared as: (kufr) by the Quran, and Hadith,
means throwing taunts, passing sarcastic remarks, engineering disputes
over self-invented and absurd doubts, or to give such meaning of a verse
of the Qur’an as is counter to other verses of the Qur’an and to the
binding textual imperatives of Sunnah – something that amounts to
alteration in the Qur’an. Otherwise, any honest inquiry about something
ambiguous or vague, or trying to find a solution of a difficult word or
expression, or to mutually investigate and discuss possibilities while
deducing injunctions and rulings from the text of some verse are things
not included under this jidal, in fact, it is an act of thawab (reward) in its
own place (al-Qadi al-Baidawi, Qurtubi and Mazhari).
Shafi, Muhammad (2008). Maariful Quran. (Vol .7 surah 40 verse 4). English-MaarifulQuran-MuftiShafiUsmaniRA-Vol-7.pdf (islamicweblibrary.com)