Sahih Bukhari
Companions of the Prophet
Volume: 005 / Book Number: 057 / Hadith Number: 118
Narrated Hisham's father:
When Allah's Apostle was in his fatal illness, he started visiting his wives and saying, "Where will I be tomorrow?" He was anxious to be in 'Aisha's home. 'Aisha said, "So when it was my day, the Prophet became silent (no longer asked the question)."