Prophet (Allah bless him and grant him peace) instructed,

‘O Abu Hurairah ! If you desire not to be separated from my company on the Day of Judgement and eventually enter the Paradise along with me then love me in way that you can not forget me. 

And remember that if you love me then you will not abandon three things,

1. Following my example (Sunna)

2. Longing for me 

3. Sending salutations (salwaat) on me excessively. ‘

Fatuhaat Makkiya, volume 37 chapter 560, page 121