W.P.S: from the MESSENGER OF ALLAH (SAWW), who said:
On the Day of Judgement every slave of ALLAH will have to answer the following four questions to ALLAH (SWT) before being able to even move:
How did you spend your life?
How did you use your body?
How did you earn your wealth and how did you spend it?
Did you love the family of the PROPHET (SAWW)?
So someone asked the PROPHET (SAWW)s, “What is the sign of loving you?” The PROPHET (SAWW) placed his hands over ALI BIN ABI TALEB (ASWS)'s head and replied, “Loving him.”
Ref :Amaali of Mufid 353, Amaali of Tousi 1:124