“Biblical times” covers a broad section of history’s timeline, since Bible history spans several thousand years and a number of cultures. Through those years and in those cultures, betrothal traditions varied. However, some elements of betrothal were consistent throughout.
“Engagements” in Bible times, like those in modern-day Western countries, were heterosexual relationships preliminary to marriage. Then, as now, the engagement period gave the bride time to prepare for her new role, to gather personal belongings, to adjust relationships with parents, siblings, and friends, and in some cases to become better acquainted with her fiancé. The groom used the engagement period for similar matters, including completing the house in which he would raise his family.
Arranged marriages were common in Bible times, and it was possible that the bride and groom might not even know each other until they met at the wedding ceremony. If the parents arranged the marriage while the bride, the groom, or both were too young for marriage, a much longer betrothal would ensue. What seems strange to modern Westerners is that neither sexual attraction nor love was considered a necessary prelude to engagement or marriage. Parents who arranged a marriage for their children assumed that love and affection would grow out of the intimate acquaintance and sexual bonding that naturally takes place in a marriage. This mindset helps explain why Ephesians 5:25–33 commands Christian husbands to love their wives and Christian wives to respect their husbands. Such love and respect grew after the wedding and was not necessarily required beforehand.
In modern Western culture, there is a clear distinction between betrothal/engagement and marriage. In the cultures of Bible times, the distinction was much less definitive. Betrothal in most eras of Bible history involved two families in a formal contract, and that contract was as binding as marriage itself. Betrothal then was more of a business transaction between two families than a personal, romantic choice. Dowry or bride price agreements were included, so that a broken engagement required repayment of the dowry. After betrothal, all that remained were three matters: the wedding celebration, the bride’s move into the groom’s house, and the consummation of the marriage.
The best-known example of betrothal is that of Jesus’ mother, Mary, and her fiancé, Joseph. When Joseph learned that Mary was pregnant, and before he understood the miraculous nature of the conception, he thought that Mary had violated her betrothal, which was as binding as a marriage contract. At first, Joseph believed that his only recourse was to divorce her, or “put her away.” Matthew records the account: “This is how the birth of Jesus Christ came about. His mother Mary was pledged to be married to Joseph, but before they came together, she was found to be with child through the Holy Spirit. Because Joseph her husband was a righteous man and did not want to expose her to public disgrace, he had in mind to divorce her quietly” (Matthew 1:18–19). Matthew says that Mary was “pledged to be married,” but he also calls Joseph “her husband.” The fact that a “divorce” was required to break the betrothal shows that their premarital contract was legally binding. If, even during the betrothal period, Mary had been sexually intimate with someone other than Joseph, she would have been guilty of adultery.
 Got Questions Ministries. (2010). Got Questions? Bible Questions Answered. Bellingham, WA: Logos Bible Software.