Wikipedia:Read the source
|This page is an essay, containing the advice or opinions of one or more Wikipedia contributors on the deletion policy. Essays are not Wikipedia policies or guidelines. Some essays represent widespread norms; others only represent minority viewpoints.||
|This page in a nutshell: First read the source, then comment.|
Be sure to read the source first, before discussing the credibility and/or application of a given source to an article in WP:AFD. Failure to read the source can lead to unclear arguments and frustration among those involved in the discussion. Never assume a source does or does not say something.
Further, not reading a source can lead others to believe your response is a lie or that you are not being honest. While your intentions may be real and in good faith, your actions may lead others to believe otherwise.
The solution is simple: read the source first, then discuss it.