The word "blasphemy" has four different menings.

In Jewish law, cursing or reviling God or the King (who was
God's representative), was considered "blasphemy". And, the
penalty for such was death by stoning. In later usage,
pronouncing the forbidden name of God was considered
"blasphemy". This have rise to "tetragramnation",
(tet-ra-gram-a-ton), a word of four letters WITHOUT vowel
points. Examples are "Y H W H" for "Yahweh" and
"J H V H" for "Johovah".

Thus, if you cursed God (or the King); and later pronounced
OR wrote God's name, you were gulity of "Blasphemy",
the penatly for which was death by stoning!!!

From page 297, Always Growing in the Faith, by Gene Dirr.
Available at www.amazom.com.