Sayyiduna Ibn Umar (may Allah be pleased with them both) narrates: I was sitting with the Prophet (peace and blessings be upon him) when a man came, greeted him (peace and blessings be upon him) with salam and then went away. I said: "O Messenger of Allah, by Allah, I love this man." He (peace and blessings be upon him) said: "Have you told him?" I said: "No." He (peace and blessings be upon him) said: "Tell your brother that." So I followed him, greeted him with salam, took hold of his shoulders and said: "By Allah, I love you for the sake of Allah." He replied: "By Allah, I too love you for the sake of Allah." Then I said: "Had the Prophet (peace and blessings be upon him) not ordered me to tell you, I would not have done so."
Imam al-Tabarani (may Allah have mercy on him) said: "No one narrated this hadith from Ubaydullah bin Umar and Musa bin Uqbah (may Allah have mercy on them both) except Zuhayr bin Muhammad, and no one from Zuhayr except Hassan; al-Azraq bin Ali is alone in narrating it."
Hadith Referenceالمعجم الأوسط / باب العين / 4328
Hadith Takhrij«أخرجه ابن حبان فى «صحيحه» برقم: 569، والطبراني فى «الكبير» برقم: 13361»