Once the Apter Rebbe did not have an Etrog for Sukkot. At the last minute, a Jew turned up with a magnificent Etrog and gave it as a gift to the Apter. 

However, he immediately became ill and died.  On his deathbed, the Apter promised him that he and his children would recite the Kaddish for him and he chose the Kaddish after the Kegavna prayer. 

 

I.F.

Mezibizer Rebbe