Abu Hurairah (Radiyallaahu `anhu), The Prophet of Allah (Sallallaahu `alayhi wa sallam) said,

“If Allah loves a person, He calls Gabriel (Alayhis-Salaam) saying: ‘Allah loves so and so; O Gabriel, love him.‘ Gabriel would love him, and then Gabriel would make an announcement among the residents of the Heaven, ‘Allah loves so-and-so, therefore, you should love him also.‘ So, all the residents of the Heavens would love him and then he is granted the pleasure of the people of the earth.”

Sahih al Bukhari Hadith
Volume # 8, Hadith # 66