Abu Hurairah (may Allah be pleased with him) reports that the Messenger of Allah (peace and blessings be upon him) said: "There are three persons whose help from Allah is assured: one who strives in the path of Allah, the second is a slave who has entered into a contract for his freedom and intends to pay it off, and the third is one who marries seeking chastity." Imam Tirmidhi says:
This hadith is Hasan.