ذَنْبِ

A word in the Arabic language will either be 1) a verb or 2) a noun or 3) a particle – ذَنْبِ is a noun

A noun may either be 1) Definite or indefinite 2) Masculine or feminine 3) Singular, dual or plural 4) Nominative, accusative or genitive

الذَّنْبُ is the natural state of this definite noun and it becomes الذَّنْبِ due to: 1) a preposition that precedes it or 2) a possessed noun that precedes it or 3) it’s a noun of dependent declension a) نَعْتٌ / صِفَطٌ adjectives b) التَّوْكِيْدُ emphatic c) المَعْطُوْفٌ conjunction d) البَدَلُ synonym

الذَّنْبِ loses it’s definite article, becoming ذَنْبِ due to it being a possessed noun

Crime; Fault; Offense; Sin; Any act having an evil result

To track, make a tale, add appendix, follow closely, become spotted

Surah/Below are the 8 verses in the holy Quran containing the genitive, possessed nounذَنْبِ
Verse
12-29 
29-40 
40-55 
47-19 
48-2 
55-39 
67-11 
however, they denied him and killed it so, their Lord destroyed themفَكَذَّبُوْهُ فَعَقَرُوْهَا فَدَمْدَمَ عَلَيْهِم رَبُّهُم
91-14due to their sin and made them equal in destructionبِذَنْبِهِم فَسَوَّاهَا