Genesis 37:21

And Reuben heareth, and delivereth him out of their hand, and saith, 'Let us not smite the life;'

Genesis 42:22

And Reuben answereth them, saying, 'Spake I not unto you, saying, Sin not against the lad? and ye hearkened not; and his blood also, lo, it is required.'

Genesis 9:5

'And only your blood for your lives do I require; from the hand of every living thing I require it, and from the hand of man, from the hand of every man's brother I require the life of man;

Genesis 35:22

and it cometh to pass in Israel's dwelling in that land, that Reuben goeth, and lieth with Bilhah his father's concubine; and Israel heareth.

Joshua 10:28

And Makkedah hath Joshua captured on that day, and he smiteth it by the mouth of the sword, and its king he hath devoted, them and every person who is in it -- he hath not left a remnant; and he doth to the king of Makkedah as he did to the king of Jericho.

Matthew 10:28

'And be not afraid of those killing the body, and are not able to kill the soul, 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 cometh to pass in Israel's dwelling in that land, that Reuben goeth, and lieth with Bilhah his father's concubine; and Israel heareth.
Genesis 42:22
And Reuben answereth them, saying, 'Spake I not unto you, saying, Sin not against the lad? and ye hearkened not; and his blood also, lo, it is required.'

Not kill him

Joshua 10:28
And Makkedah hath Joshua captured on that day, and he smiteth it by the mouth of the sword, and its king he hath devoted, them and every person who is in it -- he hath not left a remnant; and he doth to the king of Makkedah as he did to the king of Jericho.
Genesis 9:5
'And only your blood for your lives do I require; from the hand of every living thing I require it, and from the hand of man, from the hand of every man's brother I require the life of man;
Matthew 10:28
'And be not afraid of those killing the body, and are not able to kill the soul, but fear rather Him who is able both soul and body to destroy in gehenna.