Genesis 30:25

כאשר ילדה רחל את יוסף WHEN RACHEL HAD BORN JOSEPH — after the birth of him who was to become Esau’s adversary (Genesis Rabbah 73:7) — as it is said (Obadiah 1:18) “And the house of Jacob shall be a fire, and the house of Joseph a flame and the house of Esau for stubble“. Fire (Jacob) that has no flame (Joseph) has no effect at a distance. Therefore, when Joseph was born Jacob put his trust in the Holy One, blessed be He, and wished to return home (Obadiah 1:18).

וַיְהִ֕י כַּאֲשֶׁ֛ר יָלְדָ֥ה רָחֵ֖ל אֶת־יוֹסֵ֑ף וַיֹּ֤אמֶר יַעֲקֹב֙ אֶל־לָבָ֔ן שַׁלְּחֵ֙נִי֙ וְאֵ֣לְכָ֔ה אֶל־מְקוֹמִ֖י וּלְאַרְצִֽי׃

And it came to pass, when Raĥel had born Yosef, that Ya῾aqov said to Lavan, Send me away, that I may go to my own place, and to my country.