Fetching a string of IDS in a Column using explode (Eloquent model Laravel)

Question

For the table Exam I have this:

--id----section_id

--1----- 2,3

when I use this in Exam.php Model:

public function Sections(){
    return $this->belongsTo(Section::class, 'section_id');
}

It only shows and take in consideration the section_id=2 but not both of the IDS. How I can get Info from both Ids ?

in the blade.php :

  @foreach ($Exams as $exams)
             <tr>
                <td>{{$exams->id}}</td>
                <td>{{$exams->Sections}}</td>
            </tr>
    @endforeach