It was narrated from Abu Hurairah that the Messenger of Allah said: "There are three who are promised the help of Allah: The Mukatab who wants to buy his freedom, the one who gets married seeking to keep himself chaste, and the Mujahid who fights in the cause of Allah." *Mukatab: the slave who has made a contract of manumission. (Using translation from Nasāʾī 3218)  

أَنَّ رَسُولَ اللهِ ﷺ قَالَ «ثَلَاثَةٌ حَقٌّ عَلَى اللهِ عَوْنُهُمُ الْمُكَاتَبُ الَّذِي يُرِيدُ الْأَدَاءَ وَالنَّاكِحُ الَّذِي يُرِيدُ الْعَفَافَ وَالْمُجَاهِدُ فِي سَبِيلِ اللهِ»