Beat biblical epic, getting shot of the Tablets (5)
I believe the answer is:
throb
'beat' is the definition.
(throbbing is a kind of beating)
I don't understand how the rest of the clue works.
(Other definitions for throb that I've seen before include "Beat rhythmically" , "Beat like heart" , "Martin -; Kingsley -" , "Pound" , "Beat quickly from excitement etc" .)