(18) باب مَا يُكْرَهُ مِنَ التَّشْدِيدِ فِي الْعِبَادَةِ
Narrated 'Aisha:
A woman from the tribe of Bani Asad was sitting with me and Allah's Apostle (p.b.u.h) came to my house and said, "Who is this?" I said, "(She is) So and so. She does not sleep at night because she is engaged in prayer." The Prophet (ﷺ) said disapprovingly: Do (good) deeds which is within your capacity as Allah never gets tired of giving rewards till you get tired of doing good deeds."
Reference: Sahih al-Bukhari 1151
In-book reference: Book 19, Hadith 32
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 2, Book 21, Hadith 251