How to make thumbnail images click into blog posts

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Do you want to make all the thumbnails link to their respective blog posts? If so, use the following code in the functions.php file: 

add_filter( 'post_thumbnail_html', 'my_post_image_html', 10, 3 );
function my_post_image_html( $html, $post_id, $post_image_id ) {
    $html="<a href="" . get_permalink( $post_id ) . '" title="' . 
        esc_attr( get_post_field( 'post_title', $post_id ) ) . '">' . $html . '</a>';
    return $html;
}

If you only want the post thumbnails to link to the post permalink in a specific loop, use the following code in the query like Jamal mentioned earlier:

if ( has_post_thumbnail() ) : 
    ?><a href="https://wordpress.stackexchange.com/questions/30542/<?php the_permalink(); ?>" title="<?php the_title_attribute(); ?>" ><?php 
        the_post_thumbnail(); 
    ?></a><?php 
endif;

The loop is in the index.php page. Take a look at the WordPress Codex regarding The Loop and you can see where pieces of the code should fall depending on your theme.

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