In the Name of Allah , the Compassionate , the Merciful
Imam Sadiq [a] said: "Once a man came to my father. He [a] asked him whether he had a wife and he answered he had not. Then, my father said that he would not like to possess the world and what it includes but sleep one night without having a wife. Then he [a] added that the two rak'at prayer established by a married man is worthier than that an unmarried man keeps vigil at night praying and fasts during the day. After that, he [a] gave him seven golden coins (Dinar) and told him to marry with that."
Bihar-ul-Anwar, vol. 103, p. 217