Jamieson, Fausset and Brown on Genesis 35:16

Ge 35:16-27. Birth of Benjamin--Death of Rachel, &c.

16. And they journeyed from Beth-el--There can be no doubt that much enjoyment was experienced at Beth-el, and that in the religious observances solemnized, as well as in the vivid recollections of the glorious vision seen there, the affections of the patriarch were powerfully animated and that he left the place a better and more devoted servant of God. When the solemnities were over, Jacob, with his family, pursued a route directly southward, and they reached Ephrath, when they were plunged into mourning by the death of Rachel, who sank in childbirth, leaving a posthumous son [Ge 35:18]. A very affecting death, considering how ardently the mind of Rachel had been set on offspring (compare Ge 30:1).