خَتَمَ ٱللَّهُ عَلَىٰ قُلُوبِهِمۡ وَعَلَىٰ سَمۡعِهِمۡۖ وَعَلَىٰٓ أَبۡصَٰرِهِمۡ غِشَٰوَةٞۖ وَلَهُمۡ عَذَابٌ عَظِيمٞ ٧
Allāh has set a seal upon their hearts and upon their hearing, and over their vision is a veil.1 And for them is a great punishment.
Translation: Saheeh International (English)
1 A covering preventing them from discerning guidance. This condition is a direct result of their arrogance and persistence in sin.
Each word's meaning and sound
Allah has sealed their hearts, locking inside them their falsehood, and has placed a seal on their hearing, so that they do not listen to nor accept the truth. He has put a cover over their eyes, so that they do not see the truth in its clarity. They will suffer greatly. After describing the disbelievers, who are at fault inside and out, He describes the hypocrites, who appear good on the outside, but are not so inwardly:
Al-Mukhtasar in interpreting the Noble Quran