זה ספר תולדות אדם (בראשית ה:א)

After his marriage to the daughter of the holy Reb Aharon of Chernobyl zt’’l, Reb Yissocher Dov zt’’l resided in his wife’s hometown of Chernobyl. Reb Yissocher Dov zt’’l kept a sefer – book filled with copious notes of Torah thoughts shared by his esteemed father-in-law. 

Reb Yissocher Dov zt’’l wasn’t yet blessed with children, and he would continuously ask his father, Reb Yehoshua of Belz zt”l, for a bracha to merit children.  One day, Reb Yissocher Dov lost the precious sefer where he had written copious scholarly entries that he gathered.  Reb Yissocher Dov was very distraught and shared his pain with his father.

Reb Yehoshua zt’’l consoled his son: “It says in parshas Bereishis: זה ספר תולדות אדם – and I hereby wish upon you, ‘זה ספר’ – this loss of your sefer ‘תולדות אדם’ – will warrant you, good children!”