Good Manners and Form (Al-Adab)
Ṣaḥīḥ al-Bukhārī 6113
مَا زَالَ بِكُمْ صَنِيعُكُمْ حَتَّى ظَنَنْتُ أَنَّهُ سَيُكْتَبُ عَلَيْكُمْ، فَعَلَيْكُمْ بِالصَّلاَةِ فِي بُيُوتِكُمْ، فَإِنَّ خَيْرَ صَلاَةِ الْمَرْءِ فِي بَيْتِهِ، إِلاَّ الصَّلاَةَ الْمَكْتُوبَةَ
mā zāla bikum ṣanīʿukum ḥattā ẓanantu annah sayuktabu ʿalaykum, faʿalaykum bi-aṣ-ṣalāhi fī buyūtikum, fa-inna khayra ṣalāhi al-marʾi fī baytihi, illā aṣ-ṣalāha al-maktūbaha
Transliteration generated from the Arabic vowel marks
The full narration
Narrated Zaid bin Thabit:Allah's Messenger (ﷺ) made a small room (with a palm leaf mat). Allah's Messenger (ﷺ) came out (of his house) and prayed in it. Some men came and joined him in his prayer. Then again the next night they came for the prayer, but Allah's Messenger (ﷺ) delayed and did not come out to them. So they raised their voices and knocked the door with small stones (to draw his attention). He came out to them in a state of anger, saying, "You are still insisting (on your deed, i.e. Tarawih prayer in the mosque) that I thought that this prayer (Tarawih) might become obligatory on you. So you people, offer this prayer at your homes, for the best prayer of a person is the one which he offers at home, except the compulsory (congregational) prayer
Source
Ṣaḥīḥ al-Bukhārī · 6113