It is narrated from Sayyiduna Jarir (may Allah be pleased with him) that he said: "Since I accepted Islam, the Messenger of Allah (peace and blessings be upon him) never kept me from (coming in), and whenever he saw me, he could not help but smile."
Hadith Referenceالمعجم الكبير للطبراني / باب الجيم / 2206