אֵ֚לֶּה בְּנֵ֣י בִלְהָ֔ה אֲשֶׁר־נָתַ֥ן לָבָ֖ן לְרָחֵ֣ל בִּתּ֑וֹ וַתֵּ֧לֶד אֶת־אֵ֛לֶּה לְיַעֲקֹ֖ב כָּל־נֶ֥פֶשׁ שִׁבְעָֽה׃
These are the sons of Bilhah, whom Laban gave unto Rachel his daughter, and these she bore unto Jacob; all the souls were seven.
Read kabbalistic (mystical) interpretation of Genesis 46:25: and classical mystical sources.