פירוש על שמואל א 15:6

To the Kenites. Who were Yisro's descendants,⁹See Shoftim 1:16. who were residing in the wilderness of Yehudah, in the south of Arod, who went to Ya'aveitz to learn Torah, Arod being Amoleik. The Canaanite king of Arod was Amoleik, for it is stated [about him]; "who lived in the South,"¹⁰Bamidbar 21:1. and, "Amoleik dwells in the southern part of the land."¹¹Ibid., 13:29.

To all the Bnei Yisroel. Who partook from his [Yisro's] meal, Moshe, Aharon and all the elders of Yisroel.¹²See Shemos 18:12. It is considered as though he acted kindly with all the Bnei Yisroel.¹³It may also refer to Yisro’s hospitality of welcoming Moshe into his home when he escaped from Paroh [Shemos 2:20-21]. Based on this event R. Nechemyah in Maseches Berachos 63b states ‘how great is the reward for one who invites a Torah scholar into his house, gives him to eat and drink, and shares his possessions with him.’ Others believe that the act of kindness with all the Bnei Yisroel refers to the good advice that Yisro gave to Moshe with regard to setting up a system of judges [Shemos 18:14-26], because this benefitted the entire nation.