ءَامَنَهُم

ءَامَنَهُم is a verbal sentence  (الجُمْلَةُ الفِعْلِيَّةُ) consisting of a derived, form 4, past tense verb, a subject and a third-person, masculine, plural object

فِعْلٌ وَمَفْعُوْلٌ بِهِمَفْعُوْلٌ بِهِ فَاعِلٌ فِعْلٌ
Verbal sentenceObject SubjectVerb
الجُمْلَةُ الفِعْلِيَّةُAttached pronounDetached pronoun
AccusativeNominative
He secured themءَامَنَهُم=هُم+ضَمِيْرٌ مُسْتَتِرٌ تَقْدِيْرُهُ هُوَ+ءَامَنَ
He protected themthemHe protected
Surah/Below is the only verse in the holy Quran containing the compoundءَامَنَهُم
Verse
106-4Who fed them against hunger and secured them against fearالَّذِي أَطْعَمَهُم مِّن جُوْعٍ وَّآمَنَهُم مِّن خَوْفٍ