MySQL order by field in Eloquent

Using either DB::raw() or orderByRaw directly should work:

$models = Model::orderByRaw('FIELD(language, "USD", "EUR", "JPN")')->get();
// or
$models = Model::orderBy(DB::raw('FIELD(language, "USD", "EUR", "JPN")'))->get();

Use implode in the second parameter of FIELD()

 $facilities = $query->with(['interest','city:id,name', 'state:id,name'])
        ->Active()
        ->whereIn('facility_id', $facilities_list)
        ->orderByRaw('FIELD(facility_id, '.implode(", " , $facilities_list).')')
        ->get();