(16) باب الْعَبْدِ إِذَا أَحْسَنَ عِبَادَةَ رَبِّهِ وَنَصَحَ سَيِّدَهُ
Narrated Abu Huraira:
Allah's Messenger (ﷺ) said, "A pious slave gets a double reward." Abu Huraira added: By Him in Whose Hands my soul is but for Jihad (i.e. holy battles), Hajj, and my duty to serve my mother, I would have loved to die as a slave.
Reference: Sahih al-Bukhari 2548
In-book reference: Book 49, Hadith 32
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 3, Book 46, Hadith 724