# have not defiled themselves with women

Possible meanings are 1) "have never had immoral sexual relations with a woman" or 2) "have never had sexual relations with a woman." Defiling oneself with women may be a symbol of worshiping idols.

# they have kept themselves sexually pure

Possible meanings are 1) "they have not had sexual relations with a woman who was not their wife" or 2) "they are virgins."

# follow the Lamb wherever he goes

Doing what the Lamb does is spoken of as following him. Alternate translation: "they do whatever the Lamb does" or "they obey the Lamb" (See: [[rc://en/ta/man/jit/figs-metaphor]])

# redeemed from among mankind as firstfruits

"Firstfruits" here is a metaphor for the first offering to be made to God in celebration of harvest. Alternate translation: "purchased out of the midst of the rest of mankind as a special celebration of salvation"  (See: [[rc://en/ta/man/jit/figs-metaphor]])