According to John the Baptist, what lies at the foot that threatens all the fruitless trees?

ANSWER

The Ax

Luke 3 :

(7) John said to the crowds coming out to be baptized by him, “You brood of vipers! Who warned you to flee from the coming wrath? (8) Produce fruit in keeping with repentance. And do not begin to say to yourselves, ‘We have Abraham as our father.’ For I tell you that out of these stones God can raise up children for Abraham. (9) The ax is already at the root of the trees, and every tree that does not produce good fruit will be cut down and thrown into the fire.”
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