Displaying Post Content on tooltip


I’d like to display the content of a custom post type, when hovering over a “question mark icon”.
In order to get the data, I used the following code (series is the custom post type):

                <?php foreach ($series as $post): ?>
                    <?php setup_postdata($post); ?>
                    <a class="fa fa-question-circle" href="#" data-toggle="tooltip" title=<?php echo get_the_content('post_content', $post->ID); ?>></a>
                    <?php echo the_title(); ?>
                <?php endforeach; ?>
                <?php wp_reset_postdata(); ?>
            <?php endif; ?>

For some reason, it only displays the first word of the post content when I hover over the question mark.
When I look at the element information on that page in my browser, it shows me all of the series’ content but only the first word is in quotation marks.
Here is a screenshot of the element information and as you can see, only the first word “Diese” is in quotation marks:

Am I missing something on how to get the whole content displayed?

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