Sahih al-Bukhari 7262Book 95, Hadith 16
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 ".
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. "