Genesis 37:21

And Reuben heard it, and rescued him out of their hand, and said Let us not smite him, so as to take his life!

Genesis 42:22

And Reuben responded to them, saying - Spake I not unto you saying, Do not sin against the child! And ye hearkened not? His very blood, therefore lo! it is required.

Genesis 9:5

And surely your blood, of your lives, will I require, From the hand of every living creature, will I require it, - and from the hand of man From the hand of each ones brother, will I require the life of man:

Genesis 35:22

And it came to pass while Israel inhabited that land, that Reuben went and lay with Bilhah his father's concubine; and Israel heard of it. And so the Sons of Israel came to be Twelve.

Joshua 10:28

And Joshua captured, Makkedah, on that day, and smote it with the edge of the sword, and, the king thereof, devoted he to destruction, them and all the souls that were therein, he left no survivor, - but did unto the king of Makkedah, as he had done unto the king of Jericho.

Matthew 10:28

And be not in fear, by reason of them that are killing the body, - and, the soul, are not able to kill. But fear, rather, him who is able, both soul and body, to destroy in gehenna!

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 it came to pass while Israel inhabited that land, that Reuben went and lay with Bilhah his father's concubine; and Israel heard of it. And so the Sons of Israel came to be Twelve.
Genesis 42:22
And Reuben responded to them, saying - Spake I not unto you saying, Do not sin against the child! And ye hearkened not? His very blood, therefore lo! it is required.

Not kill him

Joshua 10:28
And Joshua captured, Makkedah, on that day, and smote it with the edge of the sword, and, the king thereof, devoted he to destruction, them and all the souls that were therein, he left no survivor, - but did unto the king of Makkedah, as he had done unto the king of Jericho.
Genesis 9:5
And surely your blood, of your lives, will I require, From the hand of every living creature, will I require it, - and from the hand of man From the hand of each ones brother, will I require the life of man:
Matthew 10:28
And be not in fear, by reason of them that are killing the body, - and, the soul, are not able to kill. But fear, rather, him who is able, both soul and body, to destroy in gehenna!