Reference for Taanit 43:3

הוה קא חלשא דעתיה דרבא משום דאביי אמרו ליה מסתייך דקא מגנית אכולה כרכא

They then said to him, They are yours, we took them away from you; tell us, pray, of what did you suspect us. He replied: I said to myself, perhaps the Rabbis needed money to redeem captives and they were ashamed to tell me.

Jastrow