Genesis 30:17

“And God hearkened unto Leah, etc.] To the prayer of Leah, as the Targum of Jonathan, for more children: the desire of these good women for the company of their husband was not from lust, or an amorous desire in them, but for the sake of having many children, as appears by giving their maids to him; and the reason of this was, as Bishop Patrick well observes, that the promise made to Abraham of the multiplication of his seed, and of the Messiah springing from thence, might be fulfilled; and is the true reason of Moses’s taking such particular notice of those things, which might seem below the dignity of such a sacred history: and she conceived, and bare Jacob the fifth son; the fifth he had…”