It was narrted that Ubayy bin Ka'b said:
"The Messenger of Allah said: 'The first person with whom Allah will shake hands will be 'Umar, (and he is) the first person to be greeted with the Salam, and the first person who will be taken by the hand and admitted into Paradise.'"
English reference: Vol. 1, Book 1, Hadith 104
Arabic reference: Book 1, Hadith 109