To be clear, demonstrate this using the words He spoke while He walked the Earth - and, yes, once again this means prior to His crucifixion.
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This criteria of yours carries with it, I think, a preconception. It carries a presupposition to which I am not happy to express a lot of sympathy or compliance. What are the presuppositions of this criteria you establish as a goal post. They are something like this:
1.) The default approach to the New Testament is that Christ is dead and gone.
2.) The default approach is that things allegedly said by Jesus after resurrection then, of course, cannot be trusted.
3.) The default attitude should be that He only "walked the earth" before He died, after which He no longer "walked the earth".
4.) The default position should be that we know today better what He taught then the twelve apostles who certainly were either dishonest or trying to make a conspiracy of mythology.
5.) The prophets and apostles know less than the modernist "higher critics" about the nature of Christ's ministry.
By setting the goal post as you think is the only legitimate default challenge you strongly imply these presuppositions. I am not empathetic to your skeptical presuppositions.
IF I go along with your restrictions it shall not be an indication that I at all agree that this is how a anti-miraculous default criteria
HAS to be set up to understand the ministry of Jesus Christ.
With that understanding on your part, I don't mind maybe humoring you a bit. So then, prior to His crucifixion while "He walked on earth" (the phrase which you love).
The table meeting and the last supper was PRIOR to His being crucified, Two passages describe the nature of the
"new covenant" which He came to be an executor of.
Grasp the
teaching rather than worry about the ritual ways of tradition.
Luke 22:19-20
"And He took a loaf and gave thanks, and He broke it and gave it to them, saying, This is My body which is being given for you; do this in remembrance of Me.
And similarly the cup after they had dined, saying, This cup is the new covenant established in My blood, which is being poured out for you."
And
Matthew's recording for us of the same discussion:
Matthew 26:26-28
"And as they were eating, Jesus took bread and blessed it, and He broke it and gave it to the disciples and said, Take eat; this is My body.
And He took a cup and gave thanks, and He gave it to them, saying, Drink of it all of you, For this is My blood of the covenant, which is being poured out for many for forgiveness of sins."
This is BEFORE His crucifixion. Do not attempt to further tune your criteria.
These are the quite significant parting words of Jesus Christ
BEFORE the arrest, trial, and subsequent execution of crucifixion - the breaking of His body and the spilling of His blood.