Matthew 18:6

But whoever leads one of these little ones, who believe in me, to do wrong, had better have a great millstone hung around his neck to sink him to the bottom of the sea.

Mark 9:42

And whoever leads one of these lowly believers to do wrong, might better have a huge millstone hung around his neck and be thrown into the sea.

Matthew 18:10

"Be careful not to look with scorn on a single one of these little children, for I tell you that in heaven their angels have uninterrupted access to my Father in heaven.

Matthew 18:14

Just so it is not the will of my Father in heaven that a single one of these little ones be lost.

Luke 17:1-2

Now He said to His disciples: "It is inevitable that snares to evil will come, but a curse be on the man through whom they come!

Acts 9:5

He asked, "Who are you, sir?" And He said, "I am Jesus whom you are persecuting.

Romans 14:13-15

Then let us stop criticizing one another; instead, do this, determine to stop putting stumbling blocks or hindrances in your brother's way.

Romans 14:21

The right thing to do is not to eat meat, or drink wine, or do anything else, that makes your brother stumble.

Romans 15:1-3

It is the duty of us who are strong to bear with the weaknesses of those who are not strong, and not merely to please ourselves.

1 Corinthians 8:9-13

But you must see to it that this right of yours does not become a stumbling block to overscrupulous people.

1 Corinthians 10:32-33

Stop being stumbling blocks to Jews or Greeks or to the church of God,

2 Thessalonians 1:6-9

indeed, it is right for God to repay with crushing sorrows those who cause you these crushing sorrows,

Treasury of Scripture Knowledge

Summary

But whoso shall offend one of these little ones which believe in me, it were better for him that a millstone were hanged about his neck, and that he were drowned in the depth of the sea.

General references

Bible References

Little

Matthew 18:10
"Be careful not to look with scorn on a single one of these little children, for I tell you that in heaven their angels have uninterrupted access to my Father in heaven.
Luke 17:2
It would be better for him to have a millstone hung around his neck, and he be hurled into the sea, than for him to ensnare one of these lowly ones.

General references

2 Corinthians 6:3
To keep my ministry from being found fault with, I am trying not to put a single hindrance in anybody's way.
Philippians 2:4
Stop looking after your own interests only but practice looking out for the interests of others too.