There are some commentaries on the Qur’an (tafseers) which have a strong linguistic element, and within such commentaries one may sometimes find that the different types of ishtiqaaq have been used to offer a depth of meaning and insight that would not ordinarily be understood had reference to the ishtiqaaq not been made.
One such example of this can be found in the tafseer of al-Qurtubi in which he commented on the regret expressed in verse 54 of Surah Yunus,
وَلَوْ أَنَّ لِكُلِّ نَفْسٍ ظَلَمَتْ مَا فِي الأَرْضِ لاَفْتَدَتْ بِهِ وَأَسَرُّواْ النَّدَامَةَ لَمَّا رَأَوُاْ الْعَذَابَ وَقُضِيَ بَيْنَهُم بِالْقِسْطِ وَهُمْ لاَ يُظْلَمُونَ
And if every self that has done injustice had whatever is in the earth, it would indeed ransom itself therewith; and they will keep secret [their] regret (al-nadaamah) as soon as they see the torment, and [the case] is decreed between them with equity, and they are not done an injustice.
al-Qurtubi commented that the word used for regret – al-nadaamah – comes from the root noon-daal-meem ن-د-م. He then mentioned that these letters rearranged form the root daal-meem-noon د-م-ن, which means to continue and persist in something.
Such knowledge undoubtedly deepens our appreciation of the type of regret that such a person as is mentioned in the verse will feel – a regret that is continual and everlasting, and from the chains of which they will never break free.
May Allah protect us from being one of these people. Ameen.