Genesis 49:3 (BSB)

Reuben, you are my firstborn, my might, and the beginning of my strength, excelling in honor, excelling in power.

From Genesis 49. Also in the ESV.

Commentary on Genesis 49:3

• John Calvin (Reformed), Calvin's Commentaries on Genesis 49:3: 3. Reuben, thou art my first-born He begins with the first-born, not for the sake of honor, to confirm him in his rank; but that he may the more completely cover him with shame, and humble him by just reproaches. For Reuben is here cast down from his primogeniture; because he had polluted his father’s bed by incestuous intercourse with his mother-in-law.
• Matthew Henry (Presbyterian), Matthew Henry's Complete Commentary on Genesis 49:1-4: Here is, I. The preface to the prophecy, in which, 1. The congregation is called together (Gen 49:2): Gather yourselves together; let them all be sent for from their several employments, to see their father die, and to hear his dying words. It was a comfort to Jacob, now that he was dying, to see all his children about him, and none missing, though he had sometimes thought himself bereaved.
• John Gill (Reformed Baptist), Exposition of the Old and New Testaments on Genesis 49:3: Reuben, thou art my firstborn,.... Jacob addressed himself to Reuben first, in the presence of his brethren, owned him as his firstborn, as he was, Gen 29:31 did not cashier him from his family, nor disinherit him, though he had greatly disobliged him, for which the birthright, and the privileges of it, were taken from him, Ch1 5:1.
• Geneva Bible Notes (Reformed), Geneva Bible Study Notes on Genesis 49:3: Reuben, thou [art] my firstborn, my might, and the beginning of my strength, the excellency of dignity, and the excellency of power: (b) Begotten in my youth. (c) If you have not left your birthright by your offence.