--- /dev/null
+``source``
+==========
+
+.. versionadded:: 1.15
+ The ``source`` function was added in Twig 1.15.
+
+.. versionadded:: 1.18.3
+ The ``ignore_missing`` flag was added in Twig 1.18.3.
+
+The ``source`` function returns the content of a template without rendering it:
+
+.. code-block:: jinja
+
+ {{ source('template.html') }}
+ {{ source(some_var) }}
+
+When you set the ``ignore_missing`` flag, Twig will return an empty string if
+the template does not exist:
+
+.. code-block:: jinja
+
+ {{ source('template.html', ignore_missing = true) }}
+
+The function uses the same template loaders as the ones used to include
+templates. So, if you are using the filesystem loader, the templates are looked
+for in the paths defined by it.
+
+Arguments
+---------
+
+* ``name``: The name of the template to read
+* ``ignore_missing``: Whether to ignore missing templates or not