Al-Sharif Hasan bin Hamza Al-Alawi narrated from Ubaidullah bin Musa, from Al-Zohari, from ‘Urwah, from Ibn Abbas, who said:
The MESSENGER OF ALLAH (SWT) said:
Shaking hands with ALI (ASWS) is exactly like shaking hands with me, and shaking hands with me is like shaking hands with the corners of the Throne of ALLAH (SWT).
Embracing ALI (ASWS) is exactly like embracing me, and embracing me is like embracing all of the Prophets.
ALLAH (SWT) forgives all of the sins of those who shake hands with those who love ALI (ASWS) and takes them to Paradise without judgement.
(Ref : Bihar Volume No.27 Page 115 Hadees No. 90)