Al-Sha'bi (may Allah have mercy on him) narrated: When the Messenger of Allah (peace and blessings be upon him) arrived after conquering Khaybar, he (peace and blessings be upon him) was told: Sayyiduna Ja'far (may Allah be pleased with him) has come back from the Negus (al-Najashi). So the Prophet (peace and blessings be upon him) said: "I do not know which of the two makes me happier, the arrival of Ja'far or the conquest of Khaybar." Then he (peace and blessings be upon him) kissed him between his eyes.
Hadith Referenceالمعجم الكبير للطبراني / باب الجيم / 1456