The voice in the dream named itself. I am Eloha who did reveal Myself to thee at Beth El where thou didst anoint the pillar, and swear the oath before Me (Genesis 31:13). Targum Pseudo-Jonathan marks the moment as a calling-in of an old promise.
Twenty years earlier, a younger Jakob had laid his head on a stone in the wilderness and seen a ladder full of angels. He had poured oil on the stone. He had sworn, in tears and awe, that the Lord would be his God. And then he had walked east into two decades of labor under Laban.
Now heaven spoke as if no time had passed at all. The same voice. The same God. The oath still on the books. Arise now, go forth from this land, and return to the land of thy birth.
The Maggid teaches: the vows you made in a moment of revelation are remembered by the One to whom you made them. Heaven does not forget Beth El just because you have been busy. When the time comes to fulfill the promise, the voice will come back to you by name.