Shaking hands after prayers is a motto of Shias, it must be avoided
Shaking hands after prayers is a motto of Shias, it must be avoided:
Question: What is the status of shaking hands or shaking hands before or after the Eid prayer, while it is considered a cause of intimacy and a cause of sin?
Answer: Shaking hands or shaking hands after Eid or other prayers is an heresy. Regarding shaking hands, the Messenger of Allah (ﷺ) said that the cause of takfir is sin, and every situation after prayers is abominable, and it is a way of disobedience and must be avoided.
(Jami al-Fatawa: Volume: 5: Page: 224)