Narrated Abu Musa:The Prophet (ﷺ) entered a garden and told me to guard its gate. Then a man came and asked permission to enter. The Prophet, said, "Permit him and give him the good news that he will enter Paradise." Behold! It was Abu Bakr. Then `Umar came, and the Prophet (ﷺ) said, "Admit him and give him the good news that he will enter Paradise." Then `Uthman came and the Prophet (ﷺ) said, "Admit him and give him the good news that he will enter Paradise. "
حَدَّثَنَا سُلَيْمَانُ بْنُ حَرْبٍ، حَدَّثَنَا حَمَّادٌ، عَنْ أَيُّوبَ، عَنْ أَبِي عُثْمَانَ، عَنْ أَبِي مُوسَى، أَنَّ النَّبِيَّ صلى الله عليه وسلم دَخَلَ حَائِطًا وَأَمَرَنِي بِحِفْظِ الْبَابِ فَجَاءَ رَجُلٌ يَسْتَأْذِنُ فَقَالَ " ائْذَنْ لَهُ، وَبَشِّرْهُ بِالْجَنَّةِ ". فَإِذَا أَبُو بَكْرٍ، ثُمَّ جَاءَ عُمَرُ فَقَالَ " ائْذَنْ لَهُ، وَبَشِّرْهُ بِالْجَنَّةِ ". ثُمَّ جَاءَ عُثْمَانُ فَقَالَ " ائْذَنْ لَهُ، وَبَشِّرْهُ بِالْجَنَّةِ ".
Bukhari
Accepting Information Given by a Truthful Person • Hadith 16