Musnad Ahmad 1153:313

Ibn Numayr narrated to us, Muhammad and Yazid narrated to us, they said: Muhammad informed us, from Abu Salamah, from Aisha, who said: We had a mat that we would spread out during the day, and we would partition it off for ourselves at night. The Messenger of Allah (ﷺ) prayed one night, and the people of the mosque heard his prayer. They woke up in the morning and mentioned that to the people, so the people increased in number on the second night. The Messenger of Allah (ﷺ) looked out at them and said: "Take upon yourselves of deeds that which you can bear, for Allah, the Mighty and Majestic, does not grow weary until you grow weary." Aisha said: "The most beloved of deeds to the Messenger of Allah (ﷺ) were those that were most consistent, even if they were few." "And when he performed a prayer, he would establish it firmly." And Yazid said: A mat that we would spread out during the day, and we would partition it off at night.