(5)Chapter: Allah Will Help the One Who Marries, Seeking To Keep Himself Chaste

Narrated Abu Hurairah:
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.

Sunan an-Nasa'i 3218 (Hadith Hasan) ... another similar one by Tirmidithi is hasan too

(O mankind, indeed the promise of Allah is truth) - Surat Fatir , Ayah 5

O ' People of the Marriage section, despair not... if you fear Allah and from your intentions of marriage is to be chaste... Then Allah Aza wa Jal has promised to give you عون (Help).

Chaste: abstaining from extramarital sexual intercourse.