Language:
كتاب فضائل أصحاب النبى صلى الله عليه وسلم
62  
Companions of the Prophet
(30)
Chapter: The superiority of 'Aishah رضي الله عنها
(30)
باب فَضْلِ عَائِشَةَ رضى الله عنها
Sahih al-Bukhari 3772

Narrated Abu Wail:

When `Ali sent `Ammar and Al-Hasan to (the people of) Kufa to urge them to fight, `Ammar addressed them saying, "I know that she (i.e. `Aisha) is the wife of the Prophet (ﷺ) in this world and in the Hereafter (world to come), but Allah has put you to test, whether you will follow Him (i.e. Allah) or her."

حَدَّثَنَا مُحَمَّدُ بْنُ بَشَّارٍ، حَدَّثَنَا غُنْدَرٌ، حَدَّثَنَا شُعْبَةُ، عَنِ الْحَكَمِ، سَمِعْتُ أَبَا وَائِلٍ، قَالَ لَمَّا بَعَثَ عَلِيٌّ عَمَّارًا وَالْحَسَنَ إِلَى الْكُوفَةِ لِيَسْتَنْفِرَهُمْ خَطَبَ عَمَّارٌ فَقَالَ إِنِّي لأَعْلَمُ أَنَّهَا زَوْجَتُهُ فِي الدُّنْيَا وَالآخِرَةِ، وَلَكِنَّ اللَّهَ ابْتَلاَكُمْ لِتَتَّبِعُوهُ أَوْ إِيَّاهَا‏.‏
Reference : Sahih al-Bukhari 3772
In-book reference : Book 62, Hadith 117
USC-MSA web (English) reference : Vol. 5, Book 57, Hadith 116
  (deprecated numbering scheme)