Sforno on Genesis 26:25/ספורנו על בראשית כ״ו:כ״ה

1ויקרא בשם ה'...ויכרו שם עבדי יצחק באר—ואבימלך הלך אליו. After Yitzchok had roused himself to proclaim the name of the Lord publicly, his servants started digging a successful well without encountering opposition. Not only this, but Avimelech now came to him in order to make a treaty with him, and not to interfere with him anymore. [I wonder whether the word הלך “he walked on foot,” somewhat unusual for the mode a king travels is meant to convey to us that he humiliated himself. Ed.]