The MESSENGER OF ALLAH (S.a.w.a.), said:
O ALI (ASWS)! If a slave worships ALLAH (SWT) for as long as Nuh lived in his nation, spends his wealth and gold which is as high as the mountain of Ohud in the way of ALLAH (SWT), goes to Hajj one thousand times and is murdered between Safa and Marwa, but does not love you, he will not even smell Paradise and will not be able to enter it.
O ALI (ASWS)! Loving you is such a good deed that if people do it, no bad deed can harm them. And hating you is such a bad deed that if people do it, no obedience can benefit them.
O ALI (ASWS)! A hypocrite will not love you even if you scatter jewels on him. O ALI (ASWS)! A believer will not hate you even if you cut his nose with your sword, because loving you is Iman and hating you is hypocrisy.
O ALI (ASWS)! No one loves you but a pious believer, and no one hates you but a wicked hypocrite.
(Ref: Amaali Al-Mufid 31)