Sahih Bukhari Volume 5, Book 57, Hadith Number 118.

Narated By 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).”