“And if anyone causes one of these little ones who believe in me to sin,

 

 it would be better for him to be thrown into the sea with
a large millstone tied around his neck.”
Mark 9:42

 

“But if anyone causes one of these little ones who believes
in me to sin, it would be better for him to have a large millstone
hung around his neck and to be drowned in the depths of the sea.”
Matthew 18:6

Jesus said to his disciples: “Things that cause people
to sin are bound to come, but woe to that person through
whom they come. It would be better for him to be thrown
into the sea with a millstone tied around his neck than
for him to cause one of these little ones to sin.
So watch yourselves.

Luke 17:1-3