Try using tax_query:
$tax_query = array(
'relation' => 'AND',
array(
'taxonomy' => 'category',
'field' => 'id',
'terms' => 1
),
array(
'taxonomy' => 'category',
'field' => 'id',
'terms' => 2
),
array(
'taxonomy' => 'category',
'field' => 'id',
'terms' => 3
)
);
$query->set( 'tax_query', $tax_query );
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