Genesis 37:3 (BSB)

Now Israel loved Joseph more than his other sons, because Joseph had been born to him in his old age; so he made him a robe of many colors.

From Genesis 37. Also in the ESV.

Commentary on Genesis 37:3

• Matthew Henry (Presbyterian), Matthew Henry's Complete Commentary on Genesis 37:1-4: Moses has no more to say of the Edomites, unless as they happen to fall in Israel's way; but now applies himself closely to the story of Jacob's family: These are the generations of Jacob. His is not a bare barren genealogy as that of Esau (Gen 36:1), but a memorable useful history. Here is, 1. Jacob a sojourner with his father Isaac, who has yet living, Gen 37:1.
• John Gill (Reformed Baptist), Exposition of the Old and New Testaments on Genesis 37:3: Now Israel loved Joseph more than all his children,.... He being the firstborn of his beloved Rachel, and a lovely youth, of a beautiful aspect, very promising, prudent and pious: the reason given in the text follows: because he was the son of his old age; being ninety one years of age when he was born; and the youngest children are generally most beloved, and...
• Jamieson-Fausset-Brown (Reformed), Commentary Critical and Explanatory on the Whole Bible on Genesis 37:3: son of his old age--Benjamin being younger, was more the son of his old age and consequently on that ground might have been expected to be the favorite. Literally rendered, it is "son of old age to him"--Hebrew phrase, for "a wise son"--one who possessed observation and wisdom above his years--an old head on young shoulders.
• Adam Clarke (Methodist), Clarke's Commentary on the Bible on Genesis 37:3: A coat of many colors - כתנת פסים kethoneth passim, a coat made up of stripes of differently colored cloth. Similar to this was the toga praetexta of the Roman youth, which was white, striped or fringed with purple; this they wore till they were seventeen years of age, when they changed it for the toga virilis, or toga pura, which was all white.