Sunan At-Tirmidhi

Narrated Abu Hurairah: That the Messenger of Allah (ﷺ) 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