How can I find the closest previous sibling with class using jQuery?

$('li.current_sub').prevAll("li.par_cat:first").text("woohoo");

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<ul>
  <li class="par_cat"></li>
  <li class="sub_cat"></li>
  <li class="sub_cat"></li>
  <li class="par_cat">// this is the single element I need to select</li>
  <li class="sub_cat"></li>
  <li class="sub_cat"></li>
  <li class="sub_cat current_sub">// this is where I need to start searching</li>
  <li class="par_cat"></li>
  <li class="sub_cat"></li>
  <li class="par_cat"></li>
</ul>