Sahih Bukhari
Merits of the Helpers in Madinah (Ansaar)
Volume: 005 / Book Number: 058 / Hadith Number: 157
Narrated Sad bin Abi Waqqas:
I have never heard the Prophet saying about anybody walking on the earth that he is from the people of Paradise except 'Abdullah bin Salam. The following Verse was revealed concerning him: "And a witness from the children of Israel testifies that this Qur'an is true" (46.10)