Moses
Genesis 30:12ESV·traditional attribution

Leah’s servant Zilpah bore Jacob a second son.

Matthew Henry Presbyterian @wholebiblehenry

We have here the bad consequences of that strange marriage which Jacob made with the two sisters. Here is, I. An unhappy disagreement between him and Rachel (Gen 30:1, Gen 30:2), occasioned, not so much by her own barrenness as by her sister's fruitfulness.

Commenting on Genesis 30:1-13

John Gill Reformed Baptist @doctorgill

And she said unto her,.... Leah to Rachel, taking this opportunity to bring out a thing which had some time lain with uneasiness upon her mind: is it a small thing that thou hast taken away my husband? got the greatest share of his affections, and had most of his company; which last was very probably the case, and more so, since Leah had left...

Keil & Delitzsch Lutheran @keilanddelitzsch

Gen 30:9-13 Zilpah’s Sons. - But Leah also was not content with the divine blessing bestowed upon her by Jehovah. The means employed by Rachel to retain the favour of her husband made her jealous; and jealousy drove her to the employment of the same means. Jacob begat two sons by Zilpah her maid.

Commenting on Genesis 30:9-13