The hadith of al-Nawawi's Forty reached us through named chains hadith scholars verify.

The evidence

1. The chain of transmitters — passage/arbaun-05

   1. person/al-qasim-ibn-muhammad
   2. person/aisha
   3. person/muhammad

   A Forty hadith whose chain runs through al-Qasim from Aisha from the Prophet — an example of a docum'en'ted isnad.

2. chronicle — work/arbaun-nawawi

   The first hadith of int'en'tion in al-Nawawi's Forty with its chain, quoted as recorded.

3. object — work/arbaun-nawawi

   The Book of the Forty itself — forty hadith al-Nawawi chose as the foundations of the faith.