Or HaChaim on Deuteronomy 33:6/אור החיים על דברים ל״ג:ו׳

1 יחי ראובן ואל ימות, "May Reuven live and not die, etc." According to Sifri on our verse the words "may Reuven live" mean that Moses prayed that Reuven should have a share in the hereafter. Perhaps what is meant is that the leaders of that tribe who died during the uprising of Korach should have a share in the hereafter. [seeing that a prayer for someone who had died hundreds of years ago would seem futile and even sinful. Ed.] According to Bamidbar Rabbah 18, the 250 men who died offering incense were all heads of the courts, most of them from the tribe of Reuven. Seeing that one could have assumed that the community of rebels including Korach would not have a share in the hereafter, Moses prayed that Reuven, i.e. the tribe, should live. Granted that only 250 of their number had been guilty of joining the uprising, the fact that these 250 men represented the elite of the tribe could have brought disaster on the whole tribe and jeopardised their share in the hereafter.

2It is also possible that Moses referred to Reuven, Jacob's son, personally. His continued share in the hereafter might have been endangered seeing that his most illustrious offspring had become guilty of the uprising against Moses. All of this is in accordance with the view expressed by one scholar in Sanhedrin 108 that the rebellious group of Korach did not forfeit their share in the hereafter.

3ויהי מתיו מספר, "even though he may be few in numbers." Moses prayed that the surviving members of the tribe be righteous seeing that their holy roots had been undermined due to their leaders having been guilty of taking part in Korach's uprising. The prayer concerning their numbers may be understood in accordance with Sanhedrin 26 where the Talmud discusses the prayer of King Chiskiyah that G'd should not be influenced by the attitude of Shevna his heretic scribe who commanded the support of the majority amongst the people of beleaguered Jerusalem at the time. At that time G'd replied to Chiskiyah not to worry because numbers are not relevant when He deals with the wicked. Similarly, Moses mentioned that though there may have been a substantial number of the tribe of Reuven who were not righteous, G'd should not judge the tribe by this numerically significant segment. This may be the meaning of Samuel II 23,3 that צדיק מושל יראת אלוקים, "a righteous person" (even when in the minority) rules' G'd.