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fa-bi-mā naqḍihim mīthāqahum wa-kufrihim bi-ʾāyāti llāhi wa-qatlihimu l-ʾanbiyāʾa bi-ghayri ḥaqqin wa-qawlihim qulūbunā ghulfun bal ṭabaʿa llāhu ʿalayhā bi-kufrihim fa-lā yuʾminūna ʾillā qalīlan
Then because of their breaking their covenant, their defiance of Allah’s signs, their killing of the prophets unjustly and for their saying, ‘Our hearts are uncircumcised’… Indeed, Allah has set a seal on them for their unfaith, so they do not have faith except a few.
— Ali Quli Qarai
Surah An-Nisa', Verse 155
155. "So, for their breaking their covenant and their disbelief in the Signs of Allah and their slaying the prophets wrongfully and their saying: 'Our hearts are covered', nay! but Allah sealed them for their disbelief, so they do not believe save a few. "
In this verse, the Qur'an points to some other parts of the wrong doings of the Children of Israel, and also those committing offences and hostilities that the Jews performed against the prophets of Allah. At first, it refers to the breach of promise and disbelief of a group of them, by whom the slaughter of many prophets occurred. It says:
Following to this breach of promise, they rejected the Signs of Allah and paved the way of opposition.
They did not suffice only to this wrong-doing, but also they set their hands to another great crime. They killed the leaders and the guides of the way of Truth, viz. the prophets. They slew the prophets without having any reason for their action.
They were so insolent in committing offences that they mocked the statements of the prophets and they used to explicitly say to them that their hearts were locked so that they hindered them to hear and accept the invitation of the prophets.
Here, the Qur'an adds a sense that their hearts are sealed totally and no truth penetrates into them, but the reason of that situation is their own infidelity and disbelief. That is why they do not believe in truth, except a small group of them who avoid these kinds of obstinacies and that they pave the path of truth. It says: