“These are the ones that did not defile themselves with women; in fact, they are virgins. These are the ones that keep following the Lamb no matter where he goes. These were bought from among mankind as firstfruits to God and to the Lamb,

Revelation 14:4,

The fact that the 144,000 “are virgins” does not mean that members of this class are necessarily unmarried in the flesh. The apostle Paul wrote to Christians who had a heavenly calling that, whereas there are advantages to Christian singleness, marriage is preferable under certain circumstances. (1 Corinthians 7:1, 2, 36, 37) What characterizes this class is a spiritual virginity. They have avoided spiritual adultery with worldly politics and with false religion. (James 4:4; Revelation 17:5) As the betrothed bride of Christ, they have kept themselves pure, “without a blemish in among a crooked and twisted generation.”​—Philippians 2:15.