Jami` at-Tirmidhi, Book 22, Hadith 38 (In-Book) ⓘ
Narrated Abu Hurairah: That the Messenger of Allah said: "There are three for whom it is a right upon Allah to help him: The Mujahid in the cause of Allah, the Mukatab who intends to fulfill (the Kitabah), and the one getting married who intends chastity." [Abu 'Eisa said:] This Hadith is Hasan.
حَدَّثَنَا قُتَيْبَةُ، حَدَّثَنَا اللَّيْثُ، عَنِ ابْنِ عَجْلاَنَ، عَنْ سَعِيدٍ الْمَقْبُرِيِّ، عَنْ أَبِي هُرَيْرَةَ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " ثَلاَثَةٌ حَقٌّ عَلَى اللَّهِ عَوْنُهُمُ الْمُجَاهِدُ فِي سَبِيلِ اللَّهِ وَالْمُكَاتَبُ الَّذِي يُرِيدُ الأَدَاءَ وَالنَّاكِحُ الَّذِي يُرِيدُ الْعَفَافَ " . قَالَ أَبُو عِيسَى هَذَا حَدِيثٌ حَسَنٌ .
also referenced under: Hadith 1655 (Reference) & Volume 3, Book 20, Hadith 1655 (DarusSalam)