The Book of the Merits of the Companions
حَدَّثَنِي زُهَيْرُ بْنُ حَرْبٍ، حَدَّثَنَا إِسْحَاقُ بْنُ عِيسَى، حَدَّثَنِي مَالِكٌ، عَنْ أَبِي النَّضْرِ، عَنْ عَامِرِ بْنِ سَعْدٍ، قَالَ سَمِعْتُ أَبِي يَقُولُ، مَا سَمِعْتُ رَسُولَ اللَّهِ صلى الله عليه وسلم يَقُولُ لِحَىٍّ يَمْشِي أَنَّهُ فِي الْجَنَّةِ إِلاَّ لِعَبْدِ اللَّهِ بْنِ سَلاَمٍ .Amir b. Sa'd reported that he heard his father (Sa'd b. Abi Waqqas) say:never heard Allah's Messenger (ﷺ) say unto one living and moving about that he was in Paradise except to 'Abdullah b. Salim
From Sahih Muslim, whose reports the scholars accept as authentic.