It
is written in the Torah
"And the writing was that of G-d's engraved (Haruth) upon the
Tablets of Stone" (Exodus c32, v16).
In Pirqei
Aboth (Ethics of the Fathers)
it is stated
in connection with the above phrase:
"Read not 'engraved'
(Haruth)
but 'freedom'
(Heruth),
for the
only free man is one who occupies
himself
with the study of the Torah."