His eyes shall see his destruction, i.e. he shall be destroyed; as to see death, is to die, Psalms 89:48 Hebrews 11:5; and to see affliction, or any kind of evil, is to feel it Psalms 90:15 Lamentations 3:1; and to see good, is to enjoy it, Job 7:7, Job 9:25 Psalms 34:12. Or this phrase may be emphatical, he shall foresee his ruin hastening towards him, and not be able to prevent or avoid it; he shall sensibly feel himself sinking and perishing; which aggravates his misery. He shall drink; not sip or taste, but drink; which word commonly notes the abundance of the thing spoken of.
Related Commentaries of Job 21:20
Job 21:20
20 His eyes shall see his destruction, and he shall drink of the wrath of the Almighty.