Albert Barnes Commentary Leviticus 21:7

"They shall not take a woman that is a harlot, or profane; neither shall they take a woman put away from her husband: for he is holy unto his God." — Leviticus 21:7 (ASV)

Profane - A woman who has been seduced, or one of illegitimate birth. A somewhat stricter rule for the priests’ marriages was revealed to the prophet in later times (Ezekiel 44:22).