Sefer Nifla’im Maasecha quotes the Payer Rebbe zy”a as relating the following story:
The Sanzer Rov zy”a and the Tzemach Dovid of Dinov zy”a shared a close friendship. The Dinover Rebbe once was traveling and he stopped in Sanz to visit the Sanzer Rov. The two tzadikim spoke for a long time and when the Dinover was about to depart, he said, “Sanzer Rov, I have a kasha.”
The Sanzer Rov asked him what his kasha was and he replied, “My kasha is ‘kasha aeilei preidaschem. It is hard for me to part with you.”