What is the definition of "wajib" according to the 'Usuliyyun (principles of Islamic jurisprudence scholars), and what is the completion of the Hadith "The people of Paradise..." and who narrated it?

The 'Wajib' (obligatory) according to the Usul scholars (scholars of legal principles) is that which is demanded from the accountable individual with obligation. As for the Ahadith (prophetic narrations) related to the "people of Paradise," they include:

- That the people of Paradise will be 120 rows, eighty of which are from this Ummah (nation of Prophet Muhammad) and forty from the rest of the nations.

- That they will be beardless, youthful, with kohl-lined eyes, their youth will not fade, and their clothes will not wear out.

- That they are of three types: a just, charitable, and divinely guided ruler; a merciful and compassionate man; and a chaste, self-sufficient person with a family.