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Job 21:23ESV·author unknown

One dies in his full vigor, being wholly at ease and secure,

Matthew Henry Presbyterian @wholebiblehenry

Job had largely described the prosperity of wicked people; now, in these verses, I. He opposes this to what his friends had maintained concerning their certain ruin in this life. "Tell me how often do you see the candle of the wicked put out? Do you not as often see it burnt down to the socket, until it goes out of itself? Job 21:17.

Commenting on Job 21:17-26

John Gill Reformed Baptist @doctorgill

His breasts are full of milk,.... As this is not literally true of men, some versions read the words otherwise; his bowels or intestines are full of fat, as the Vulgate Latin and Septuagint; and others, his sides or ribs are full of fat, as the Syriac and Arabic; the words for "side" and "fat" being near in sound to those here used; and so...

Jamieson-Fausset-Brown Reformed @jfbcommentary

Literally, "in the bone of his perfection," that is, the full strength of unimpaired prosperity [UMBREIT].