أَحَدٍ

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

أَحَدٌ is the natural state of this indefinite noun and it becomes أَحَدٍ 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

One; Alone

One, alone, Sole

نَكِرَةٌمُفْرَدٌمُذَكَّرٌمَجْرُوْرٌأ ح دبَاب سَمِعَأَحِدَ يَأْحَدُاسْمٌفَعَلٌاِسْمُ الجِنْسِ
IndefiniteSingularMasculineGenitiveRootOne / Singular / Unique / OnlyسNounPatternGeneric or common Noun
Surah/Below are the 18 verses in the holy Quran, containing the indefinite, genitive nounأَحَدٍ
Verse 
they followed what the devils promoted during the reign of Solomonوَاتَّبَعُوْا مَا تَتْلُوْا الشَّيَاطِيْنُ عَلَى مُلْكِ سُلَيْمَانَ
Solomon did not disbelieve but the devils disbelievedوَمَا كَفَرَسُلَيْمَانُ وَلَاكِنَّ الشَّيَاطِيْنَ كَفَرُوْا
teaching men magic and what came down to the two Angels at Babylonيُعَلِّمُوْنَ النَّاسَ السِّحْرَ وَمَآ أُنْزِلَ عَلَى المَلَكَيْنِ بِبَابِلَ
Harut and Marut, they however, did not teach anyone till they said,هَارُوْتَ وَمَارُوْتَ وَمَا يُعَلِّمَانِ مِنْ أَحَدٍ حَتَّى يَقُوْلَ
“We are only a test so do not disbelieve”إِنَّمَا نَحْنُ فِتْنَةٌ فَلَا تَكْفُرْ
and from these two they learn to cause separation with it, between man and his wifeفَيَتَعَلَّمُوْنَ مِنْهُمَا مَا يُفَرِّقُوْنَ بِهِ بَيْنَ المَرْءِ وَزَوْجِهِ
but they do not harm anyone with it except by the permission of Allah (SWT)وَمَا هُمْ بِضَآرِّيْنَ بِهِ مِنْ أَحَدٍ إِلَّا بِإِذْنِ اللهِ
and they learn what harms them, not what benefits themوَيَتَعَلَّمُوْنَ مَا يَضُرُّهُمْ وَلَا يَنْفَعُهُمْ
and surely, they knew that the purchasers of it would have no share in the hereafterوَلَقَدْ عَلِمُوْا لَمَنِ اشْتَرَاهُ مَا لَهُ فِي الأَخِرَةِ مِنْ خَلَاقٍ
2-102and wretched is that, for which they sold themselves, if only they knewوَلَبِئْسَ مَا شَرَوْا بِهِ أَنْفُسَهُمْ لَوْ كَانُوْا يَعْلَمُوْنَ
Say “We believe in Allah (SWT) and what was sent down to usقُوْلُوْآ ءَامَنَّا بِاللهِ وَمَآ أُنْزِلَ إِلَيْنَا
and what was sent down to Ebrahim (AS) and Ismail (AS) and Ishaq (AS) and Yaqub (AS)وَمَآ أُنْزِلَ إِلَى إِبْرَاهِيْمَ وَإِسْمَاعِيْلَ وَإِسْحَاقَ وَيَعْقُوْبَ
and the descendants and what was given to Musa (AS) and Isa (AS)وَالأَسْبَاطِ وَمَآ أُوْتِيَ مُوْسَى وَعِيْسَى
and what was given to the Prophets from their Lordوَمَآ أُوْتِيَ النَّبِيُّوْنَ مِن رَبِّهِمْ
2-136We make no distinction between any one of them and to Him we have submitted”لَا نُفَرِّقُ بَيْنَ أَحَدٍ مِنْهُمْ وَنَحْنُ لَهُ مُسْلِمُوْنَ
2-285
3-84
3-153
4-152
7-80
9-84
9-127
19-98
24-21
29-28
33-32
33-40
35-41
38-35
69-47
92-19and look not to anyone with blessings amongst him for rewardوَمَا لِأَحَدٍ عِنْدَهُ مِنْ نِّعْمَةٍ تُجْزَى