Genesis 22:23 Kabbalah

וּבְתוּאֵ֖ל יָלַ֣ד אֶת־רִבְקָ֑ה שְׁמֹנָ֥ה אֵ֙לֶּה֙ יָלְדָ֣ה מִלְכָּ֔ה לְנָח֖וֹר אֲחִ֥י אַבְרָהָֽם׃

And Bethuel begot Rebekah; these eight did Milcah bear to Nahor, Abraham’s brother.

Read kabbalistic (mystical) interpretation of Genesis 22:23: and classical mystical sources.