BT Ber 28a(51) :ודמיא ליה כמאן דמנח ליה בכיסתיה‏ : (his study) is for him as if it is placed in his bag [i.e. he has instant recall of what he has learned]
See the entire entry for kīsā, kīstā n.f. bag

BT Ber 28a(51) :תנא מיניה ארבעין זמנין‏ : he repeated it after him forty times
See the entire entry for tny vb. to repeat