An immortal part of speech!

Of an ancient man the tale is told
That he lived to be ten centuries old,
In a cave on a mountain side.
(True, he finally died.)
The fame of his wisdom filled the land,
For his head was bald, and you'll understand
His beard was long and white
And his eyes uncommonly bright.

Philosophers gathered from far and near
To sit at his feet and hear and hear,
Though he never was heard
To utter a word
But "_Abracadabra, abracadab_,
_Abracada, abracad_,
_Abraca, abrac, abra, ab!_"
'Twas all he had,
'Twas all they wanted to hear, and each
Made copious notes of the mystical speech,
Which they published next --
A trickle of text
In the meadow of commentary.
Mighty big books were these,
In a number, as leaves of trees;
In learning, remarkably -- very!

He's dead,
As I said,