Hamzah bin Yusuf bin Abdullah bin Salam (may Allah have mercy on him) narrates that Sayyiduna Abdullah bin Salam (may Allah be pleased with him) said to the Jewish rabbis: "I wish to renew my bond with the mosque of our father Ibrahim and Isma'il (peace be upon them both) (by visiting it)." So he set out towards the Messenger of Allah (peace and blessings be upon him), who was in Makkah at that time. He reached them when the people had returned from Hajj, and he found the Messenger of Allah (peace and blessings be upon him) at Mina with the people around him. I too stood with the people. When the Messenger of Allah (peace and blessings be upon him) looked at me, he said: "Are you Abdullah bin Salam?" I said: "Yes." He said: "Come near." So I went near him, and he (peace and blessings be upon him) said: "O Abdullah bin Salam, I ask you by Allah: do you not find me in the Torah as the Messenger of Allah?" I said: "Describe our Lord." Sayyiduna Abdullah bin Salam said: Thereupon Jibril (peace be upon him) came and stood before the Messenger of Allah (peace and blessings be upon him) and said to him: "Say: He is Allah, the One; Allah, the Self-Sufficient. He neither begets nor was He begotten, and there is none equal to Him." [Surah al-Ikhlas: 1-4]. So the Messenger of Allah (peace and blessings be upon him) recited it to us. Ibn Salam said: "I bear witness that there is no true god except Allah, and that you are the Messenger of Allah." Then he returned to Madinah and concealed his Islam. Then, when the Messenger of Allah (peace and blessings be upon him) migrated and arrived in Madinah, I was up on one of my date palms, picking its fruit. I heard a commotion in Madinah and said: "What is this?" The people said: "The Messenger of Allah (peace and blessings be upon him) has arrived." Ibn Salam said: I immediately threw myself down from the top of the date palm, then came running until I reached him (peace and blessings be upon him) and greeted him with salam. Then I returned, and my mother said: "You are amazing! By Allah, even if Musa bin Imran (peace be upon him) had come, you would not have thrown yourself down from the top of the date palm like this." I said: "By Allah, I am more delighted at the arrival of the Messenger of Allah (peace and blessings be upon him) than at the sending of Musa bin Imran (peace be upon him)."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 13969