Output Channel entries on another page with a matrix block

Question

I know im doing something small wrong but I cant see what at this point.

I have a channel called 'testimonialEntries' and I want to randomly output one of these entries on seperate pages. I cant output the matrix block in 'testimonialEntries' but i can the title, so i know its working just not accessing the matrix block.

{% for entries in craft.entries.section('testimonalEntries').orderBy('RAND()').limit(1).all() %}
{% block in entry.matrixBlock %}
<article>
    <h4>{{ block.heading }}</h4>]
    <p>{{ block.bodyContent }}</p>
</article>
{% endfor %}{% endfor %}

In this example im getting the entry title, but how do i also get a matrix block?

Edit: AM I getting close?

{% set testimonialEntry = craft.entries.section('testimonalEntries').orderBy('RAND()').limit(1).with(['testimonial']).one() %}
{% set testimonialEntryMatrixBlocks = testimonialEntry.testimonial %}
    {% if testimonialEntryMatrixBlocks %}
    <article>
        <p>{{ testimonialEntryMatrixBlocks.body }}</p>
        <p>{{ testimonialEntryMatrixBlocks.quote }}</p>
        <p>{{ testimonialEntryMatrixBlocks.role }}</p>
    </article>
    {% endif %}

Ok final edit incase anyone else runs across this: It Works!

    {% set testimonialEntry = craft.entries.section('testimonalEntries').orderBy('RAND()').limit(1).with(['testimonial']).one() %}
{% set testimonialEntryMatrixBlocks = testimonialEntry.testimonial %}
    {% if testimonialEntryMatrixBlocks %}
        {% for testimonial in testimonialEntryMatrixBlocks %}
        <article>
            <p>{{ testimonial.body }}</p>
            <p>{{ testimonial.quote }}</p>
            <p>{{ testimonial.role }}</p>
        </article>
        {% endfor %}
    {% endif %}

Answer 1

No need for a loop if you're just fetching a single entry:

{% set testimonialEntry = craft.entries.section('testimonalEntries').orderBy('RAND()').limit(1).one() %}
{% set testimonialEntryMatrixBlocks = testimonialEntry.matrixField.all() %}

Ideally for better performance you'd also use eager loading to load the matrix blocks at the same time as fetching the entry:

{% set testimonialEntry = craft.entries.section('testimonalEntries').orderBy('RAND()').limit(1).with(['matrixField']).one() %}
{% set testimonialEntryMatrixBlocks = testimonialEntry.matrixField %}