Ruth 1:17רות א׳:י״ז
where thou diest, I will die, and there will I be buried: the Lord do so to me, and more also, if aught but death part thee and me.
Rashi on Ruth 1:16:2רש"י על רות א׳:ט״ז:ב׳
For wherever you go, I shall go. From here our Rabbis of blessed memory derived that if a [prospective] proselyte comes to convert, we inform him of some of the punishments [for violating the commandments] so that is he decides to renege [from his intention to convert], he can renege; for out of the words of Rus, you can learn what Naomi said to her. [Naomi said.] “We may not venture outside the boundary [of 2000 cubits beyond city limits] on Shabbos.” She [Rus] replied to her, “For wherever you go I shall go.” [Naomi then said,] “We are prohibited to allow a woman to be secluded with a man who is not her husband.” She [Rus] replied, “Where you lodge, I will lodge.” [Naomi said,] “Our nation is separated from other nations by 613 commandments,” [and Rus replied,] “Your people are my people.” [Naomi said,] “Idolatry is forbidden to us,” [to which Rus replied,] “Your God is my God.” [Naomi then said,] “Four [types of] death penalties were delegated to Beis Din [to punish transgressors],” [and Rus replied,] “Where you die, I will die.” [Naomi continued,] “Two burial plots were delegated to Beis Din [to bury those executed], one for those stoned and those burned, and one for those decapitated and those strangled.” She [Rus] replied, “And there I shall be buried.”
Yevamot 47b:9יבמות מ״ז ב:ט׳
Naomi said to her: We are commanded to observe six hundred and thirteen mitzvot. Ruth responded: “Your people are my people” (Ruth 1:16). Naomi said to her: Idolatrous worship is forbidden to us. Ruth responded: “Your God is my God” (Ruth 1:16). Naomi said to her: Four types of capital punishment were handed over to a court with which to punish those who transgress the mitzvot. Ruth responded: “Where you die, I shall die” (Ruth 1:17). Naomi said to her: Two burial grounds were handed over to the court, one for those executed for more severe crimes and another for those executed for less severe crimes. Ruth responded: “And there I shall be buried” (Ruth 1:17).
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