39:23
ٱللَّهُ نَزَّلَ أَحْسَنَ ٱلْحَدِيثِ كِتَٰبًۭا مُّتَشَٰبِهًۭا مَّثَانِىَ تَقْشَعِرُّ مِنْهُ جُلُودُ ٱلَّذِينَ يَخْشَوْنَ رَبَّهُمْ ثُمَّ تَلِينُ جُلُودُهُمْ وَقُلُوبُهُمْ إِلَىٰ ذِكْرِ ٱللَّهِ ۚ ذَٰلِكَ هُدَى ٱللَّهِ يَهْدِى بِهِۦ مَن يَشَآءُ ۚ وَمَن يُضْلِلِ ٱللَّهُ فَمَا لَهُۥ مِنْ هَادٍ
Allah has sent down the best statement: a consistent Book wherein is reiteration. The skins shiver therefrom of those who fear their Lord; then their skins and their hearts relax at the remembrance of Allah. That is the guidance of Allah by which He guides whom He wills. And one whom Allah leaves astray - for him there is no guide.
Translation · Saheeh International
Tafsir
Ibn Kathīr (abridged)
The Description of the Qur'an
Here Allah praises His Book, the Noble Qur'an, which was revealed to His noble Messenger ﷺ. Allah says,
اللَّهُ نَزَّلَ أَحْسَنَ الْحَدِيثِ كِتَـباً مُّتَشَـبِهاً مَّثَانِيَ
(Allah has sent down the Best Statement, a Book, its parts resembling each other (and) oft-repeated.) Mujahid said, "This means that the entire Qur'an's parts resemble each other and are oft-repeated." Qatadah said, "One Ayah resembles another and one letter resembles another." Ad-Dahhak said, "It is oft-repeated so that people will understand what their Lord tells them." `Ikrimah and Al-Hasan said, "There may be an Ayah in one Surah, and another Ayah in another Surah that resembles it." Sa`id bin Jubayr narrated from Ibn `Abbas, may Allah be pleased with him: "Oft-repeated means that parts of the Qur'an resemble one another and repeat one another." Some of the scholars said that it was narrated from Sufyan bin `Uyaynah that
مُّتَشَـبِهاً مَّثَانِيَ
(its parts resembling each other (and) oft-repeated.) means that some passages of the Qur'an may sometimes refer to one thing, so they resemble one another, and sometimes they mention a thing and its opposite. Such as when the believers then the disbelievers are mentioned, or when Paradise then Hell are described, and so on, and this is the meaning of oft-repeated. Examples include the Ayat: