Sealing is mentioned in the Quran in these verses:

[2:7] God seals their minds and their hearing, and their eyes are veiled. They have incurred severe retribution.

[7:101] We narrate to you the history of those communities: their messengers went to them with clear proofs, but they were not to believe in what they had rejected before. God thus seals the hearts of the disbelievers.

[30:59] God thus seals the hearts of those who do not know.

[40:35] They argue against God’s revelations, without any basis. This is a trait that is most abhorred by God and by those who believe. God thus seals the hearts of every arrogant tyrant.

[45:23] Have you noted the one whose god is his ego? Consequently, God sends him astray, despite his knowledge, seals his hearing and his mind, and places a veil on his eyes. Who then can guide him, after such a decision by God? Would you not take heed?

[47:16] Some of them listen to you, then as soon as they leave they ask those who were enlightened, “What did he just say?” God thus seals their hearts and, consequently, they follow only their opinions.

To learn more, read the Quran in English.

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