Rely on facts instead of superstitions, be careful when travelling for safety purposes etc..

This hadith explains the reality of three things - transitive diseases, safar and ghouls. A transitive disease is an illness that can be passed from one person to another through contact or other means. Safar refers to the worms in the belly while ghouls are creatures that kill travelers on their journeys. According to this hadith, none of these exist in reality and they are only myths or superstitions believed by some people at the time when this hadith was narrated by Jabir b.'Abdullah who reported Allah's Apostle as saying it. This hadith teaches us not to believe in superstitions but rather rely on facts and scientific evidence for our beliefs about illnesses and creatures around us. It also encourages us to be careful when travelling so we can stay safe from any potential danger on our journey without believing in mythical creatures like ghouls which do not exist according to this hadith.