Hadithcore
Musnad Ahmad 1453
sahih· Darussalam

It was narrated that ‘Amir bin Sa"d bin Abi Waqqas said:

I heard my father say: “I never heard the Messenger of Allah (ﷺ) say concerning any living person who was walking on the face of the earth, that he would be in Paradise, except "Abdullah bin Salam.”

References1 variant
Arabic/English book
Book 8, Hadith 1453