From Sahih Bukhari (Hadith 3209):
Narrated Abu Huraira:The Prophet (ﷺ) said, "If Allah loves a person, He calls Gabriel saying, 'Allah loves so and-so; O Gabriel! Love him.' Gabriel would love him and make an announcement amongst the inhabitants of the Heaven. 'Allah loves so-and-so, therefore you should love him also,' and so all the inhabitants of the Heaven would love him, and then he is granted the pleasure of the people on the earth
Reference: Bukhari 3209