Moses
Genesis 30:5ESV·traditional attribution

And Bilhah conceived and bore Jacob a son.

John Calvin Reformed @genevareformer

5. And Bilhah conceived. It is wonderful that God should have deigned to honor an adulterous connection with offspring: but he does sometimes thus strive to overcome by kindness the wickedness of men, and pursues the unworthy with his favor.

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 Bilhah conceived, and bare Jacob a son. This was so far countenanced by the Lord, that he blessed her with conception, and Jacob with a son by her. And Bilhah conceived, and bare Jacob a son. This was so far countenanced by the Lord, that he blessed her with conception, and Jacob with a son by her. Genesis 30:6 gen 30:6 gen 30:6 gen 30:6And Rachel said,....