Ramadan 26 1438AH

1) List the 4 Khalifs with their Laqob(Nickname) and the meaning(Source) of those Laqob?

2) Hadith 1(one) of An-Nawawi is about what, just a word?

Send your answer to horlasco4real@gmail.com or 07057403269/08065964773. Include your phone number and location in your answer