Bava Metzia fol. 59, col. 1.
In the sequel to the above we are told that all the legal documents of Rabbi Eliezer containing his decisions respecting things "clean" were publicly burned with fire, and he himself excommunicated. In consequence of this the whole world was smitten with blight, a third in the olives, a third in the barley, and a third in the wheat; and the Rabbi himself, though excommunicated, continued to be held in the highest regard in Israel.
The Rabbis said to Rabbi Hamnuna, "Rav Ami has written or copied four hundred copies of the law." He replied to them, "Perhaps only (Deut. xxxiii. 4) 'Moses commanded us a law.'" (He meant he did not imagine that any one man could possibly write out four hundred complete copies of the Pentateuch.)
Bava Bathra, fol. 14, col. 1.
Rabbi Chanena said, "If four hundred years after the destruction of the Temple one offers thee a field worth a thousand denarii for one denarius, don't buy it."
Avodah Zarah, fol. 9, col. 2.
We know by tradition that the treatise "Avodah Zarah," which our father Abraham possessed, contained four hundred chapters, but the treatise as we now have it contains only five.
Avodah Zarah, fol. 14, col. 2.
The camp of Sennacherib was four hundred miles in length.
Sanhedrin, fol. 95, col. 2.