ציטירנדיקער פּירוש אויף רות 1:21

“And she left the place,” which is written concerning Naomi and Ruth. Question: Why does Rashi bring a proof from Ruth, when in Ruth, he brings a proof from here? The answer is: Without the proof from Ruth, we might think that the two leavings written here are (1) the departure of his person and (2) the departure of his money, flock and cattle which left with him. Thus, Rashi brings proof from Ruth that the departure of a tzaddik makes an impression—as there, it cannot refer to the departure of their property. For it is written there that she said (Ruth 1:21), “Hashem has brought me back empty,” indicating clearly that she had no property. And in Ruth, Rashi brings a proof from here, because we might think that it makes an impression only if no tzaddik remains behind, as was the case there. But where there are tzaddikim, how do we know that the departure of a tzaddik makes an impression? Thus Rashi proves it from here, as Yitzchok and Rivkah remained, yet Yaakov’s departure still made an impression. (See Tzeidah L’Derech, who offers a lengthy explanation.)