Midrash su Salmi 55:20

(Fol. 115) R. Jochanan said in the name of R. Simon b. Jochai: "He who leaves no son to succeed him, the Holy One, praised be He! is filled with anger at him, for it is written here (Num. 27, 8) Then shall ye cause his inheritance to pass (Haabartem), and it is written there (Zeph. 1, 15) That day is a day of wrath (Ebrah)." (Ps. 55, 20) Those who leave no changes fear no God. R, Jochanan and R. Joshua b. Levi differ. According to one a son is meant, and according to the other a disciple. We can infer that R. Jochanan is the one who holds that it refers to a disciple; for R. Jochanan said: "This is the bone of my tenth son [whom I have buried]." The inference is sustained. Now, if R. Jochanan refers to a disciple then R. Joshua b. Levi refers to a son, if so, why do we find that R. Joshua b. Levi did not go to a funeral unless the deceased was childless, because it is written (Jer. 22, 10) Weep sorely for him that goeth away, which R. Juda in the name of Rab interpreted to refer to one who passeth away without a son! It must be concluded that R. Joshua b. Levi was the one who said it refers to a disciple. Now since R. Joshua b. Levi is the one who holds it refers to a disciple, we must say that R. Jochanan is the one who holds it refers to a son. If so, then it means that R. Jochanan contradicts himself, [for above it was inferred that he held it referred to a disciple]. This is not difficult to explain, for one he said in his own name, and the other in the name of his teacher.