Matthew 1:21-23, 25

She will give birth to a son and you are to name him ‘Savior,’ for he is destined to give his life to save his people from their sins.” This happened to fulfill what the Lord had spoken through his prophet: Listen! A virgin will be pregnant, she will give birth to a Son, and he will be known as “Emmanuel,” which means in Hebrew, “God became one of us.”

but they refrained from having sex until she gave birth to her firstborn son, whom they named “Jesus.”