וַיַּ֗עַל בְּנָיָ֙הוּ֙ בֶּן־יְה֣וֹיָדָ֔ע וַיִּפְגַּע־בּ֖וֹ וַיְמִתֵ֑הוּ וַיִּקָּבֵ֥ר בְּבֵית֖וֹ בַּמִּדְבָּֽר׃
Then Benaiah the son of Jehoiada went up, and fell upon him, and slew him; and he was buried in his own house in the wilderness.
Rashi on I Kings
In his own house in the wilderness. For his home was unrestricted as a wilderness, to [help] the needy.23See Rashi in Maseches Sanhedrin 49a. Alternatively, Yoav had a house in the wilderness where his shepherds stayed when they were out with the sheep, or Yoav house was free of stolen property just like the wilderness.—Radak.