Do you mean what He told us when He walked this earth? If that's what you mean, then NO.
This is where I take an exception with dispensationalism.
I do not believe the teaching of Jesus while He walked the earth was only a temporary gospel that must be true for a short period of time and then not true for a long period of time, and then true again later on.
Dispensationalism teaches that if Israel had accepted Him as their Messiah (King Priest Prophet) then His earthly kingdom would have started at that time.
"Oh drat, I've been rejected so I guess I will have to switch to plan B and be crucified instead so I can rise from the dead and come back at a later time."
I mean, come on folks. If the kingdom started at that time, then when was He supposed to be crucified to shed His sacrificial blood to atone for sin?
It (when He walked the earth at His first coming) was
never the appointed time for the earthly kingdom to begin.
There was no on-again off-again gospel of salvation.