Rabbi Perida had a pupil to whom he had to rehearse a lesson four hundred times before the latter comprehended it. One day the Rabbi was hurriedly called away to perform some charitable act, but before he went he repeated the lesson in hand the usual four hundred times, but this time his pupil failed to learn it. "What is the reason, my son," said he to his dull pupil, "that this time my repetitions have been thrown away?" "Because, master," naively replied the youth, "my mind was so pre-occupied with the summons you received to discharge another duty." "Well, then," said the Rabbi to his pupil, "let us begin again." And he repeated the lesson a second four hundred times.
Between Azel and Azel (1 Chron. viii. 38 and ix. 44), there are four hundred camel-loads of critical researches due to the presence of manifold contradictions.
Egypt has an area of four hundred square miles.
The Targum of the Pentateuch was executed by Onkelos the proselyte at the dictation of Rabbi Eliezer and Rabbi Yehoshua, and the Targum of the prophets was executed by Jonathan ben Uzziel at the dictation of Haggai, Zachariah, and Malachi (!), at which time the land of Israel was convulsed over an area of four hundred square miles.
Mar Ukva was in the habit of sending on the Day of Atonement four hundred zouzim to a poor neighbor of his. Once he sent the money by his own son, who returned bringing it back with him, remarking, "There is no need to bestow charity upon a man who, as I myself have seen, is able to indulge himself in expensive old wine." "Well," said his father, "since he is so dainty in his taste, he must have seen better days. I will therefore double the amount for the future." And this accordingly he at once remitted to him.
"And Joseph took an oath of the children of Israel, ... ye shall carry up my bones from hence" (Gen. l. 25). Rabbi Chanena said, "There is a reason for this oath. As Joseph knew that he was perfectly righteous, why then, if the dead are to rise in other countries as well as in the land of Israel, did he trouble his brethren to carry his bones four hundred miles?" The reply is, "He feared lest, if buried in Egypt, he might have to worm his way through subterranean passages from his grave into the land of Israel."