פּירוש אויף בראשית 26:19

וַיַּחְפְּר֥וּ עַבְדֵֽי־יִצְחָ֖ק בַּנָּ֑חַל וַיִּ֨מְצְאוּ־שָׁ֔ם בְּאֵ֖ר מַ֥יִם חַיִּֽים׃

און די קנעכט פֿון יצחקן האָבן געגראָבן אין טאָל, און האָבן דאָרטן געפונען אַ ברונעם לעבעדיקע װאַסער.

Radak

ויחפרו, they dug even deeper than initially in order to supply sufficient water for the livestock.
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Rabbeinu Bahya

.ויחפרו עבדי יצחק בנחל וימצאו שם באר מים חיים , “Yitzchak’s servants dug in the valley and they discovered there a well of living water.” Nachmanides comments on this as follows: “The reason the Torah devotes so much space to the digging of wells is not because the knowledge of these facts is so useful to us, nor is the reason that the Torah wished to publicly honour Yitzchak for his activities in developing the area agriculturally. Rather, the reason is hat these details are allusions to what would happen to the Jewish people in their history long after Yitzchak had died. The words באר מים חיים, “a well of living water,” is an allusion to the Holy Temple of which it is written in Jeremiah 17,13: מקור מים חיים את ה', ”The Fount of living waters.” The first well which was called עשק is an allusion to the first Temple which became the object of contention (התעשקו) between the Jewish people and its adversaries until, in the end, they managed to destroy it. The second well, named שטנה, hatred, illustrates an even greater hatred than that which surrounded the first Temple and is an allusion to the second Temple, concerning which it has been written: “during the reign of Achashverosh, at the beginning of his reign, they issued letters of hate against all the inhabitants of Yehudah and Yerushalayim” (Ezra 4,6). This hatred continued throughout the existence of that Temple. Eventually, our opponents succeeded in destroying it and the Jewish people were exiled under very adverse conditions. The name of this well reminds you that this is where the source of Satan is to be found. Satan is none other than the spiritual representative of Esau in the celestial regions. Satan’s preoccupation in this world is to always oppose the Jewish people with a display of hatred.
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Rabbeinu Bahya

Yitzchak named the third well רחובות, the Torah mentioning ויעתק משם, that he had previously moved from the sites of the first two wells. The meaning of these words is that Yitzchak freed himself from the mentality surrounding the second Temple and he was able to concentrate and look forward to the idyllic conditions which would exist once the third Temple would be built. Concerning that Temple it has been written in Ezekiel 41,7 ורחבה ונסבה למעלה, למעלה, “and the passage will become wider and wind its way upwards and upwards.” When that time arrives there will be no strife and hatred and G’d will expand the boundaries of our country as is written: (Deut. 12,20) “it will be when G’d will expand your boundaries as He has said to you.” This verse was written concerning a time in the distant future, the time envisaged in greater detail in the prophecies of the latter chapters of the Book of Ezekiel. Thus far Nachmanides.
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