The Holy Prophet [s] said: "A two rak'at prayer that a married person establishes is worthier than when a bachelor keeps up prayers at nights and fasts during the days.
Man La Yahduruhul Faqih, vol. 3, p. 384
The Holy Prophet [s] said: "The sleep of a married person is better with Allah than an unmarried one who fasts during the day and keeps vigil at night, establishing prayers."
Bihar ul Anwar, vol. 103, p. 221
The Holy Prophet [s] said: "(Mostly) the doers of good of my Ummah are the married ones, while the vicious of them are unmarried."
Bihar-ul-Anwar, vol. 103, p. 221
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