Talha Ibn Obaidullah was one of the early reverts to Islam and among the ten blessed with the glad tidings of Paradise by the Messenger of Allah (peace and blessings of Allah be to him). He was a wealthy businessman and used to travel to different places for trade and commerce. It was during one of his trips to Syria that he met a Christian monk who informed him about the coming of the last prophet, who according to the scriptures, would appear in the land of Arabia. The news was interesting for Talha and soon after his return to Makkah he realised that the story told by the monk was going to affect his life as on his return he learnt that Muhammad Ibn Abdullah had started claiming himself as a Prophet and Abu Bakr (may Allah be pleased with him) was by his side. He was so sure of the character and honesty of both, the Messenger of Allah and Abu Bakr, that after having analysed the whole situation he said to himself, “These two people can never be partners in anything wrong or false.” He immediately went to Abu Bakr to enquire about the veracity of the claims and then Abu Bakr took him to the Messenger of Allah, where he declared his faith and said the Shahadah.
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For more details: http://english.islammessage.com/ArticleDetails.aspx?articleId=2010