(3) بَابُ قَوْلِ اللَّهِ تَعَالَى: {لاَ تَدْخُلُوا بُيُوتَ النَّبِيِّ إِلاَّ أَنْ يُؤْذَنَ لَكُمْ}
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. "
Reference: Sahih al-Bukhari 7262
In-book reference: Book 95, Hadith 16
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 9, Book 91, Hadith 367