الصُّدُوْرِ

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

الصُّدُوْرُ is the natural state of this definite noun and it changes to الصُّدُوْرِ 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

(common gender), Bosom, Chest, Breast, Upper part, Higher point, Mind, Heart, Prominentplace

To return from, come back, proceed, go forward, come to pass, happen, emanate from, strike on the chest, commence

Surah/Below are the 14 verses in the holy Quran containing the genitive nounالصُّدُوْرِ
Verse
3-154
5-7
8-43
10-57
11-5
22-46
31-23
35-38
39-7
42-24
57-6
64-4
67-13
100-10and that which is in the breasts is made knownوَحُصِّلَ مَا فِي الصُّدُوْرِ