Abu Hurairah (May Allah be pleased with him) reported:
The Messenger of Allah (ﷺ) said, "The faithful and diligent slave will have a double reward." (Abu Hurairah added:) By Him in Whose Hand the soul of Abu Hurairah is! but for Jihad in the Cause of Allah, and Hajj and kindness to my mother, I would have preferred to die as a slave.[Al-Bukhari and Muslim]. (DE)
App reference (DE): Book 12, Hadith 79 (DE)
Arabic/English book reference (DE): Book 12, Hadith 1363 (DE)