How is the ruling of the فقهاء (jurists) regarding the prohibition of attending banquets without an invitation, and considering the one who does so a "parasite," reconciled with the action of the Prophet (peace be upon him) during the Battle of the Trench when he invited people to Jabir's food without Jabir's knowledge?

The story of Jabir's hadith (definition) does not contradict the condemnation of the tufayli (uninvited guest), for tatafful (being a tufayli) is intruding upon people's food without permission. What happened in Jabir's hadith was not tatafful, as the hadith clarifies that the Prophet, peace and blessings be upon him, invited the Muhajirun and Ansar with the consent of Jabir and his wife, which removed the issue of tatafful. The prohibition of tatafful is conditioned upon the owner of the food not giving permission or not knowing of their consent. If their consent is known, then there is no harm, as mentioned by Ibn Hajar Al-Haytami. Al-Nawawi mentioned the permissibility of a guest bringing someone along if they are confident of the host's consent, and this was affirmed by Ibn 'Uthaymin, who stated that a tufayli is one who attends without an invitation, whereas one who knows of the host's consent is not considered a tufayli.