Hazrat Mahdi (as) will appear at a time when people are sick of evil, crime and oppression

Salama Ibn Zufar says: “One day, when someone said, ‘Hazrat Mahdi (as) has appeared’ in the hearing of Hudhayfa, he replied: “If Hazrat Mahdi (as) has appeared, you are near the time of the Messenger of Allah and the companions are still living among you. You are therefore really happy people. But, no, this is not true. HAZRAT MAHDI (AS) WILL APPEAR AT A TIME WHEN PEOPLE ARE SICK OF EVIL, CRIME AND OPPRESSION and when nobody living in reclusion is as saintly or as loved as him.

(Al-Hawi, Vol. 2, p.159)