John Gills Exposition of the Bible Commentary - Genesis 37:21
And Reuben heard it ,.... Overheard what they said, not being in the consultation; perhaps knowing his temper and disposition to be more mild and gentle, and being the elder brother, might fear he would overrule matters against them, and therefore Simeon and Levi did not choose to have him in the debate; or he might be at some distance and entirely absent when the consultation was held, and their intention was reported to him by some of them: and he delivered him out of their hands ;... read more
Matthew Henry's Complete Commentary - Genesis 37:12-22
Here is, I. The kind visit which Joseph, in obedience to his father's command, made to his brethren, who were feeding the flock at Shechem, many miles off. Some suggest that they went thither on purpose, expecting that Joseph would be sent to see them, and that then they should have an opportunity to do him a mischief. However, Joseph and his father had both of them more of the innocence of the dove than of the wisdom of the serpent, else he had never come thus into the hands of those that... read more