Genesis 37

"But Reuben heard it, and he delivered him out of their hands, and said, “Let us not kill him”...Then Reuben returned to the pit, and indeed Joseph was not in the pit; and he tore his clothes...So they took Joseph’s tunic, killed a kid of the goats, and dipped the tunic in the blood." vv.21,29,31

Read chapter 37.
Rueben was the oldest of the twelve brothers and would be held responsible, therefore, more than the rest of his brothers for Joseph's death.  Joseph's dreams of his family bowing down to him probably upset Rueben the most being the oldest and assured heir and birthright.  He had the most to lose, but he's the only one that fights for Joseph to not be killed by his brothers (later Judah speaks up too).  He still had to be careful and scheme how he'd free Joseph and bring him back to his father, yet that plan fell through.  Instead of telling his father the truth he covers up with a lie for him and his brothers.  So ultimately did he do the right thing?  Was it risking his own life against his brothers?  Fear of his father's response?  Hard on himself for not acting more before for Joseph?  He lives with regret for a long time.  How has scheming laid weight on you?  Hurt others?