John gives us four descriptive phrases that show us characteristics of these learners. They
have not defiled themselves with women
follow the Lamb
were redeemed from mankind
are free of lies.
Each descriptor has an additional phrase to clarify: regarding 1., they are virgins; 2., where he goes; 3., firstfruits; 4., they are blameless.
4 It is these who have not defiled themselves with women, for they are virgins. It is these who follow the Lamb wherever he goes. These have been redeemed from mankind as firstfruits for God and the Lamb,