OK, I guess you are doing MIA-EWR (CO)
EWR-YYZ-TLV (AC)

In this case, 50 minutes is way too short. Even 1hr 10 is short.

At EWR you will land in Terminal C.
You have to then get to Terminal A for the AC flight.
Not sufficient time (you might make it if you are lucky).

Call CO and request a re-route to TLV or an earlier MIA-EWR flight.
Is this an Award ticket or $$ ticket?