Musannaf Ibn Abi Shayba 36:493

Abu Usama narrated to us, from Sulayman ibn al-Mughirah, from Thabit, from Anas, who said: When the Prophet, may Allah bless him and grant him peace, passed away, Abu Bakr said to Umar, or Umar said to Abu Bakr, "Let us go to Umm Ayman to visit her." So they went to her, and she began to weep. They said to her, "O Umm Ayman, indeed what is with Allah is better for the Messenger of Allah, may Allah bless him and grant him peace." She said, "I know that what is with Allah is better for the Messenger of Allah, may Allah bless him and grant him peace, but I am weeping because the news from the heaven has been cut off from us." She stirred them to weep, so they began to weep with her.