וַיִּתֵּן֙ בְּיַד־עֲבָדָ֔יו עֵ֥דֶר עֵ֖דֶר לְבַדּ֑וֹ וַ֤יֹּאמֶר אֶל־עֲבָדָיו֙ עִבְר֣וּ לְפָנַ֔י וְרֶ֣וַח תָּשִׂ֔ימוּ בֵּ֥ין עֵ֖דֶר וּבֵ֥ין עֵֽדֶר׃
И он предал их в руки слуг своих, каждый возил их сам; и сказал слугам своим:'Проезжай передо мной, и поставь место между водителем и водителем.'
Rabbeinu Bahya
You will find that the number 400 is prominent in matters concerning the עין רע, “the evil eye.” The numerical value of the words עין רע is 400. The last letter of the Hebrew alphabet, the letter ת is equal to 400. As such it embodies all the letters in the alphabet. Similarly, עין רע is an all inclusive destructive concept. Seeing that the letter ה was added to Avram’s name (Avraham), a letter which represents the attribute of Justice, the evil eye gained power over him, and the attribute of Justice decreed exile on his descendants for four hundred years, corresponding to the עין רע, the eye of Satan. We may now understand the words ידוע תדע כי גר יהיה זרעך, “you must surely know that your descendants will be strangers” [they will be subject to a hitherto unknown attribute of G-d in their lives. Ed.], i.e. the ones who will be born as the result of the two letters ה which will be added to both your and Sarai’s name respectively, and which represent the attribute of Justice, will be subject to the evil eye. As a result of such a development ועבדום וענו אותם ארבע מאות שנה, they will be enslaved and oppressed for four hundred years. You will encounter this number again in connection with Efron, עפרן, whose name equals 400 and who demanded 400 shekel from Avraham before he allowed him to bury Sarah in the cave of Machpelah. What we learn from this is that עפרן also represented the “evil eye.” You will also find this in connection with עשו, who based his success in life on that of his father Yitzchak who represented the attribute of Justice. He too possessed עין רע, an evil eye. Midrash Bereshit Rabbah 76,8 claims that the reason Yaakov (Genesis 32,15) instructed the attendants of the herds and flocks he sent to his brother Esau as gifts to place a substantial distance between one flock and another was to satisfy Esau’s evil eye which could never get enough of anything. This may be the reason that Esau had taken precisely 400 men with him when he set out to meet (and maybe to kill) Yaakov.
Tze'enah Ure'enah
Bahya writes. “Keep a distance” [32:17]. Jacob said: Lord of the Universe, when troubles and exile will come upon Israel, do not let the troubles come quickly, one after another. Let Israel have some rest between one trouble and the next one. When they will pay taxes, they should not have to give everything away at once.35Bahya, Genesis, 32:17.