"If Allah has loved a servant [of His], He calls Gabriel (on whom be peace) and says: ‘I love So-and-so, therefore love him.’" He (the Prophet pbuh) said: "So Gabriel loves him. Then he (Gabriel) calls out in heaven, saying: ‘Allah loves So-and-so, therefore love him.’ And the inhabitants of heaven love him." He (the Prophet pbuh) said: "Then acceptance is established for him on earth." (Muslim Bukhari, Malik, & Tirmidhi)
