Genesis 37:21

And Reuben heard [it] and delivered him from their hand and said, "We must not take his life."

Genesis 42:22

Then Reuben answered them, saying, "Did I not say to you, do not sin against the boy? But you did not listen, and now, behold, his blood has been sought."

Genesis 9:5

And {your lifeblood} I will require; from {every animal} I will require it. And from the hand of humankind, from the hand of [each] man to his brother I will require the life of humankind.

Genesis 35:22

And while Israel was living in that land Reuben went and had sexual relations with Bilhah, his father's concubine. And Israel heard [about it].

Joshua 10:28

Joshua captured Makkedah on that day, and he struck it and its king with {the edge of the sword}; he utterly destroyed it and everyone that was in it. He did not leave behind a survivor. So he did to the king of Makkedah just as he did to the king of Jericho.

Matthew 10:28

And do not be afraid of those who kill the body but are not able to kill the soul, but instead be afraid of the one who is able to destroy both soul and body in hell.

Treasury of Scripture Knowledge

Summary

And Reuben heard it, and he delivered him out of their hands; and said, Let us not kill him.

Bible References

Reuben heard

Genesis 35:22
And while Israel was living in that land Reuben went and had sexual relations with Bilhah, his father's concubine. And Israel heard [about it].
Genesis 42:22
Then Reuben answered them, saying, "Did I not say to you, do not sin against the boy? But you did not listen, and now, behold, his blood has been sought."

Not kill him

Joshua 10:28
Joshua captured Makkedah on that day, and he struck it and its king with {the edge of the sword}; he utterly destroyed it and everyone that was in it. He did not leave behind a survivor. So he did to the king of Makkedah just as he did to the king of Jericho.
Genesis 9:5
And {your lifeblood} I will require; from {every animal} I will require it. And from the hand of humankind, from the hand of [each] man to his brother I will require the life of humankind.
Matthew 10:28
And do not be afraid of those who kill the body but are not able to kill the soul, but instead be afraid of the one who is able to destroy both soul and body in hell.