إِيَابَهُم

إِيَابَهُم is a phrase (شِبْهُ الجُمْلَةِ) consisting of a possessed noun and an attached, third-person, plural, possessive pronoun

PhraseNoun / NounNoun Noun
شِبْهُ الجُمْلَةِمُضَافٌ وَ مُضَافٌ إِلَيْهِمُضَافٌ إِلَيْهِمُضَافٌ
PhrasePossessive compoundPossessive noun/ownerNoun possessed/owned
their returnإِيَابَهُم=هُم+إِيَابَ
return of theirstheirsreturn of
Surah/Below is the only verse in the holy Quran containing the possessive nominal compoundإِيَابَهُم
Verse
88-25Verily to Us will be their returnإِنَّ إِلَيْنَآ إِيَابَهُم