And they say, "Never will the Fire touch us, except for [a few] numbered days." Say, "Have you taken a covenant with Allāh? For Allāh will never break His covenant. Or do you say about Allāh that which you do not know?"
The Jews hope They will only remain in the Fire for a Few Days
Allah mentioned the claim of the Jews, that the Fire will only touch them for a few days, and then they will be saved from it. Allah refuted this claim by saying,
قُلْ أَتَّخَذْتُمْ عِندَ اللَّهِ عَهْدًا
(Say (O Muhammad to them): "Have you taken a covenant from Allah'). Hence, the Ayah proclaims, `if you had a promise from Allah for that, then Allah will never break His promise. However, such promise never existed. Rather, what you say, about Allah, you have no knowledge of and you thus utter a lie about Him.' Al-`Awfi said that Ibn `Abbas said about the Ayah,
(And they (Jews) say, "The Fire shall not touch us but for a few numbered days."). "The Jews said, `The Fire will only touch us for forty days."' Others added that this was the period during which the Jews worshipped the calf.
(When Khaybar was conquered, a roasted poisoned sheep was presented to the Prophet as a gift (by the Jews). The Messenger of Allah ﷺ ordered, `Assemble before me all the Jews who were here.' The Jews were summoned and the Prophet said (to them), `Who is your father' They replied, `So-and-so.' He said, `You have lied; your father is so-and-so.' They said, `You have uttered the truth.' He said, `Will you now tell me the truth, if I ask you about something' They replied, `Yes, O Abul-Qasim; and if we should tell a lie, you will know our lie as you have about our fathers.' On that he asked, `Who are the people of the (Hell) Fire' They said, `We shall remain in the (Hell) Fire for a short period, and after that you will replace us in it.' The Prophet said, `May you be cursed and humiliated in it! By Allah, we shall never replace you in it.' Then he asked, `Will you tell me the truth if I ask you a question' They said, `Yes, O Abul-Qasim.' He asked, `Have you poisoned this sheep' They said, `Yes.' He asked, `What made you do so' They said, `We wanted to know if you were a liar, in which case we would get rid of you, and if you were a Prophet then the poison would not harm you.') Imam Ahmad, Al-Bukhari and An-Nasa'i recorded similarly.
Ma'arif al-Qur'an
Mufti Muhammad Shafi
The claim of the Jews that they would not be sent to Hell for their sins, or, if at all, only for a few days, has been interpreted by the Commentators in different ways. One of them is as follows:-
The principle is common to all the Shari'ahs that if a believer commits sins, he will receive a punishment in Hell for some time and in accordance with the degree and nature of his sins, but as he possesses 'Iman ایمان (faith), he will not be assigned to Hell for ever, and will be released after having served his term. Now, the argument on which the assertion of the Jews was based was that since the Shari ah of Sayyidna Musa (Moses علیہ السلام) had not, in their view, been abrogated, they were true believers (Mumins مؤمنین ), and had not turned into infidels (Kafirs) by denying the prophethood of Sayyidna ` Isa (علیہ السلام) (Jesus ( and of Sayyidna Muhammad ﷺ ; hence - so the argument ran - if they were sent to Hell in punishment of some sin, they would again' be taken out after a few days. This false assertion is, thus based on another false assertion. The Torah never declares that the Shari` ah of Sayyidna Musa (علیہ السلام) is meant to last forever. To claim perpetuity for it is an unfounded and false assertion, and hence the Jews who made such a claim and denied the prophethood of Sayyidna ` Isa (علیہ السلام) and of Sayyidna Muhammad ﷺ ، must on account of this denial be held to be infidels and disbelievers (Kafirs کفار ). And no Book of Allah holds out to the infidels the promise that they would be released from Hell after a while. The present verse refers to such a promise as the "pledge" of Allah. Since Allah has never made such a promise, it goes to show that the Jews were making a baseless claim.
Tazkirul Quran
Maulana Wahiduddin KhanOn ayahs 77–81
One of the reasons for the promptness with which the people of Madinah recognized the Prophet Muhammad, and believed in him, was that they had often heard from their Jewish neighbours of the coming of a final prophet. They had, therefore, been expecting his arrival. The Jews then were responsible for the Muslims’ initial fervour for Islam. It was only natural that the Muslims, in their turn, should hope that the Jews would unhesitatingly accept the prophethood of Muhammad. With every hope of a positive response, it was with sublime feelings that they called on the Jews to join them in their belief in the Prophet. How shocked the Muslims were, then, when they found that, contrary to their expectations, the Jews were not ready to accept their invitation to accept Islam. Rather, their efforts had the opposite effect, for the Prophet’s opponents took the opportunity to ask the Muslims, ‘How are you so sure about the prophethood of Muhammad? If he were truly a prophet, the Jews would have been the first to believe in him, for their knowledge of what is written in the scriptures is greater than yours.’ But acceptance of a truth is not dependent upon knowledge alone; one has also to be sincere. As for the Jews, they had already altered their own scriptures, though they knew them to be the word of God. Seeking out loopholes in any part of the Holy scriptures that did not conform to their wishes, they altered the word of God at will; religion was subordinated to their worldly interests. However true something may be, if one is bent on denial and intentional distortion, one is sure to find some justification or the other for it. Such a perverse attitude finally leads to deliberate misrepresentation of the true word of God. One who has such irreverent attitude towards the divine scriptures can never appreciate the gravity of matters concerning God: he hears the word of God, but he can always find words to show that the commandment does not apply to him; he believes in God, but his insensitivity makes him commit acts of flagrant rebellion against Him which no one who really believes that God is watching over him, and hearing what he says, would ever dare to perpetrate.