ACF Repeater Headlines

front-page.php

<?php
/**
 * ACF Repeater Field : headlines 
 * ACF Sub Field: headline (Post ID)
 */

$posts = array();
if (have_rows('headlines')) {
    while (have_rows('headlines')) {
        the_row();
        array_push($posts, get_sub_field('headline'));
    }
}
$args = array(
    'post__in' => $posts,
    'orderby' => 'post__in'
);
$the_query = new WP_Query($args);
while ($the_query->have_posts()) {
    $the_query->the_post();
    get_template_part('template-parts/content', 'headline');
}