Genesis 35:25 Kabbalah

וּבְנֵ֤י בִלְהָה֙ שִׁפְחַ֣ת רָחֵ֔ל דָּ֖ן וְנַפְתָּלִֽי׃

and the sons of Bilhah, Rachel’s handmaid: Dan and Naphtali;