Silsilat al-Ahadith al-Sahihah

Sayyiduna Abu Hurairah (may Allah be pleased with him) narrates that the Messenger of Allah (peace and blessings be upon him) said: "A man set out to visit his brother in another town. Allah sent an angel to wait for him along his way. When the man passed by him, the angel asked: 'Where are you going?' He replied: 'There is a brother of mine who lives in this town; I am going to visit him.' The angel asked: 'Is there any favor he has done for you, for which you are going to repay him?' He replied: 'No, I am only going because I love him for the sake of Allah.' The angel said: 'I am a messenger to you from Allah (and I have come to inform you) that Allah loves you as you love him for His sake.'"