Midrash su Giudici 12:9

(Fol. 91) R. Simon b. Jochai used to say that Elimelech, Machlon and Kilyon were the great men and the leaders of their generation, and they were punished only because they emigrated from Palestine, as it is said (Ruth 1, 19) All the city was in commotion about them, and people said, "Is this Naomi?" What did they mean by their question, Is this Naomi? R. Isaac said: "They wanted to see what had become of Naomi, who emigrated from the land of Israel?" R. Isaac said again: "The same day on which Ruth reached the land of Israel, the wife of Boaz died. This is why people say that before the deceased depart, the substitute for managing the house is already prepared." Rabba b. R. Huna, in the name of Rab, said: "Boaz is identical with Abzan." For what purpose does he inform us? To inform the other thing, which he (Rab b. R. Huna) said, viz: "One hundred and twenty banquets Boaz prepared for his children, as it is said (Jud. 12, 9) And he had thirty sons, and thirty daughters he sent abroad, and thirty daughters he brought in for his sons from abroad, etc. And at each marriage two banquets were given — one in the father's and one in the father-in-law's house — and not to one of them did he invite Manoah, saying: 'What return can I expect of this childless man?' " And we are taught in a Baraitha that all his children died during his (Boaz's) lifetime. And this is meant by the popular saying: "By thy life, the sixty (weaklings) thou begottest, what didst thou beget them for? Marry again and beget one as strong as sixty." R. Chanan b. Raba said again, in the name of Rab: "Elimelech, Shalam, the kinsman [referred to in Ruth 4, 1] and the father of Naomi all were the descendants of Nachshon ben Aminadab." For what purpose was this said? To teach that even a man who has distinguished ancestors to rely upon is not saved when he emigrates from Palestine.