Job 38:21

“Knowest thou [it], because thou wast then born? etc.] When light and darkness were first separated, and had their several apartments assigned them; their laws and rules given them, and their bounds and limits set them? No; he was not: and, had he been the first man, could not have been early enough to have been present at the doing of this, and so come at the knowledge thereof; since man was not made until the sixth day of the creation; or [because] the number of thy days [is] great; reach to the beginning of time, and so as old as the creation. This was not the case. Some understand these words ironically; “thou knowest” the places and bounds of light and darkness, since thou art a very old…”

“Or without the interrogation, in an ironical sense [UMBREIT]. then--when I created light and darkness (Job 15:7).”

“Knowest thou it, because thou wast then born? - This may either be a question, or it may be spoken ironically. According to the former mode of rendering it, it is the same as asking Job whether he had lived long enough to understand where the abode of light was, or whether he had an existence when it was created, and knew where its home was appointed. According to the latter mode, it is keen sarcasm. “Thou must know all this, for thou art so old. Thou hast had an opportunity of observing all this, for thou hast lived through all these changes, and observed all the works of God.” This latter method of interpreting it is adopted by Umbreit, Herder, Noyes, Rosenmuller, and Wemyss. The former,…”

“38:21 you were born before it was all created: Cp. Prov 8:25. This sarcasm resembles that of Eliphaz (Job 15:7).”

“Job 38:4, Job 38:12, Job 15:7 Job 38:22”