To promise that a statement is true. When someone "swears" to tell the truth, they are considered to be taking an oath on their faith in a god. Affirming is a substitute for taking an oath, and is most often employed where the person making the statement is an atheist or under a religious proscription from making oaths.
Error message
Deprecated function: rtrim(): Passing null to parameter #1 ($string) of type string is deprecated in Drupal\advagg_mod\EventSubscriber\InitSubscriber->onEvent() (line 130 of modules/contrib/advagg/advagg_mod/src/EventSubscriber/InitSubscriber.php).
Drupal\advagg_mod\EventSubscriber\InitSubscriber->onEvent(Object, 'kernel.request', Object) call_user_func(Array, Object, 'kernel.request', Object) (Line: 142) Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher->dispatch(Object, 'kernel.request') (Line: 145) Symfony\Component\HttpKernel\HttpKernel->handleRaw(Object, 1) (Line: 81) Symfony\Component\HttpKernel\HttpKernel->handle(Object, 1, 1) (Line: 58) Drupal\Core\StackMiddleware\Session->handle(Object, 1, 1) (Line: 48) Drupal\Core\StackMiddleware\KernelPreHandle->handle(Object, 1, 1) (Line: 191) Drupal\page_cache\StackMiddleware\PageCache->fetch(Object, 1, 1) (Line: 128) Drupal\page_cache\StackMiddleware\PageCache->lookup(Object, 1, 1) (Line: 82) Drupal\page_cache\StackMiddleware\PageCache->handle(Object, 1, 1) (Line: 48) Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle(Object, 1, 1) (Line: 51) Drupal\Core\StackMiddleware\NegotiationMiddleware->handle(Object, 1, 1) (Line: 23) Stack\StackedHttpKernel->handle(Object, 1, 1) (Line: 718) Drupal\Core\DrupalKernel->handle(Object) (Line: 19)