HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>jQuery .addBack() — find</title>
  <style>
    p, div { margin: 5px; padding: 5px; }
    .background { background: yellow; }
    .left, .right { width: 45%; float: left; }
    .right { margin-left: 3%; }
  </style>
</head>
<body>
  <div class="left">
    <strong>Before addBack()</strong>
    <div class="before-addback">
      <p>First Paragraph</p>
      <p>Second Paragraph</p>
    </div>
  </div>
  <div class="right">
    <strong>After addBack()</strong>
    <div class="after-addback">
      <p>First Paragraph</p>
      <p>Second Paragraph</p>
    </div>
  </div>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $("div.before-addback").find("p").addClass("background");
    $("div.after-addback").find("p").addBack().addClass("background");
  </script>
</body>
</html>

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jQuery .addBack() — find official demo (Try It)