Jer 51:58

“So Jeremiah wrote in a book all the evil that should come upon Babylon,.... The evil of punishment predicted and threatened: this he delivered, not by word of mouth to Seraiah to relate when he came to Babylon; but he wrote it in a book for him reread; and he wrote it himself; Baruch, his amanuensis, not being now with him: even all these words that are written against Babylon; in this and the preceding chapter: this book written by Jeremiah was a copy of them.”

“broad walls--eighty-seven feet broad [ROSENMULLER]; fifty cubits [GROTIUS]. A chariot of four horses abreast could meet another on it without collision. The walls were two hundred cubits high, and four hundred and eighty-five stadia, or sixty miles in extent. gates--one hundred in number, of brass; twenty-five on each of the four sides, the city being square; between the gates were two hundred and fifty towers. BEROSUS says triple walls encompassed the outer, and the same number the inner city. Cyrus caused the outer walls to be demolished. Taking the extent of the walls to be three hundred and sixty-five stadia, as DIODORUS states, it is said two hundred thousand men completed a stadium each day, so that the whole was completed in one year. labour . . . in the fire--The event will show that the builders of the walls have "labored" only for the "fire" in which they shall be consumed, "In the fire" answers to the parallel, "burned with fire." Translate, "shall have labored in vain," &c. Compare Job 3:14, "built desolate places for themselves," that is, grand places, soon about to be desolate ruins. Jeremiah has in view here Hab 2:13.”

“And not only are the defenders of the city to fall, but the strong ramparts also, the broad walls and the lofty towers, are to be destroyed. The adjective הרחבה is joined in the singular with the plural חמות, because the complex notion of the walls of Babylon, denoted by the latter word, is viewed as a unity; cf. Ewald, 318. ערר, in Hithpael, means "to be made bare," i.e., to be destroyed down to the ground; the inf. abs. Pilel is added to intensify the expression. Regarding the height and breadth and the extent of the walls of Babylon, cf. the collection of notices by the old writers in Duncker's Gesch. des Alt. i. S. 856ff. According to Herodotus (i. 178f.), they were fifty ells "royal cubits," or nearly 85 feet thick, and 200 ells 337 1/2 feet high; Ctesias assigns them a height of 300 feet, Strabo that of 50 ells cubits, or 75 feet, and a breadth of 32 feet. On this Duncker remarks: "The height and breadth which Herodotus gives to the walls are no doubt exaggerated. Since the wall of Media, the first line of defence for the country, had a height of 100 feet and a breadth of 20 feet, and since Xenophon saw in Nineveh walls 150 feet in height, we shall be able with some degree of certainty to assume, in accordance with the statement of Pliny (vi. 26), that the wall of Babylon must have had a height of 200 feet above the ditch, and a proportionate breadth of from 30 to 40 feet. This breadth would be sufficient to permit of teams of four being driven along the rampart, between the battlements, as Herodotus and Strabo inform us, without touching, just as the rampart on the walls of Nineveh is said to have afforded room for three chariots." (Note: For details as to the number of the walls, and statistics regarding them, see Duncker, S. 858, Anm. 3, who is inclined to understand the notice of Berosus regarding a triple wall as meaning that the walls of the river are counted as the second, and those round the royal fortress as the third line of circumvallation. J. Oppert, Expd. en Msop. i. p. 220ff., has given a thorough discussion of this question. By carefully comparing the accounts of the ancient writers regarding the walls of Babylon, and those given in the inscriptions, lately discovered and deciphered, found on the buildings of Sennacherib and Nebuchadnezzar, with the vast extent of the long mounds of rubbish on the places where the ruins are met with, he has obtained this result, - that the city was surrounded by a strong double wall with deep ditches, an outer and an inner enceinte, and that the outer or large wall enclosed a space of 513 square kilometres, i.e., a piece of ground as large as the department of the Seine, fifteen times the extent of the city of Paris in the year 1859, seven times that of the same city in 1860, while the second or inner wall enclosed an area of 290 square kilometres, much larger than the space occupied by London.) The gates leading into the city were, according to Herodotus, l.c., provided with beautifully ornamented gateways; the posts, the two leaves of the gates, and the thresholds, were of bronze. The prophecy concludes, Jer 51:58, with some words from Hab 2:13, which are to be verified by the destruction of Babylon, viz., that the nations which have built Babylon, and made it great, have laboured in vain, and only wearied themselves. Habakkuk probably does not give this truth as a quotation from an older prophet, but rather declares it as an ordinance of God, that those who build cities with blood, and strongholds with unrighteousness, make nations toil to supply food for fire. Jeremiah has made use of the passage as a suitable conclusion to his prophecy, but made some unimportant alterations; for he has transposed the words בּדי אשׁ and בּדי ריק, and changed יעפוּ into ויעפוּ, that he may conclude his address with greater emphasis. For, according to the arrangement here, וּלאמּים בּדי־אשׁ still depends on ויגעוּ, and ויעפוּ indicates the result of this toil for the enslaved nations, - they only weary themselves thereby. The genuineness of this reading is put beyond a doubt by the repetition of ויעפוּ at the close of the epilogue in Jer 51:64. What Habakkuk said generally of the undertakings of the Chaldeans, Jeremiah applied specially to the fall of the city of Babylon, because it was to exhibit its fulfilment most plainly in that event.”