Hazrat Mahdi (as) is the one who has the most knowledge among people and he is the best friend for people

He then listed the attributes of Hazrat Mahdi (as) and said: “HE IS YOUR GREATEST REFUGE, THE ONE WHO HAS THE MOST KNOWLEDGE AMONG YOU AND THE MOST CONCERNED FOR HIS FRIENDS AND THOSE HE LOVES. My Allah! Make his appearance a virtue for the elimination of sorrows and bring the fragmented community back together through him! If Allah grants you success, RUN TO SWEAR ALLEGIANCE [TO JOIN] HIM AND NEVER ABANDON HIM. IF SUCCESSFUL, IF YOU REACH HIM AND ATTAIN THE PATH TO SALVATION, NEVER GIVE UP ON HIM.  And pointing to his chest he said ‘How I wish to see him.’ (Sheikh Muhammad ibn Ibrahim Numani, al-Ghaybah al-Numani, p. 252)