كتاب الأذان
Call to Prayers (Adhaan)
Chapter: If somebody was busy with his domestic work and Iqama was pronounced and then he came out [for offering the Salat (prayer)]
باب مَنْ كَانَ فِي حَاجَةِ أَهْلِهِ فَأُقِيمَتِ الصَّلاَةُ فَخَرَجَ
Sahih al-Bukhari 676

Narrated Al-Aswad:

That he asked `Aisha "What did the Prophet (ﷺ) use to do in his house?" She replied, "He used to keep himself busy serving his family and when it was the time for prayer he would go for it."

حَدَّثَنَا آدَمُ، قَالَ حَدَّثَنَا شُعْبَةُ، قَالَ حَدَّثَنَا الْحَكَمُ، عَنْ إِبْرَاهِيمَ، عَنِ الأَسْوَدِ، قَالَ سَأَلْتُ عَائِشَةَ مَا كَانَ النَّبِيُّ صلى الله عليه وسلم يَصْنَعُ فِي بَيْتِهِ قَالَتْ كَانَ يَكُونُ فِي مِهْنَةِ أَهْلِهِ ـ تَعْنِي خِدْمَةَ أَهْلِهِ ـ فَإِذَا حَضَرَتِ الصَّلاَةُ خَرَجَ إِلَى الصَّلاَةِ‏.‏
Reference : Sahih al-Bukhari 676
In-book reference : Book 10, Hadith 70
USC-MSA web (English) reference : Vol. 1, Book 11, Hadith 644
  (deprecated numbering scheme)