וַיֹּ֣אמְר֔וּ יְרֻשַּׁ֥ת פְּלֵיטָ֖ה לְבִנְיָמִ֑ן וְלֹֽא־יִמָּחֶ֥ה שֵׁ֖בֶט מִיִּשְׂרָאֵֽל׃
At sinabi nila: “Dapat manatili ang mana ng Benjamin sa kanyang mga nakaligtas, upang hindi mapawi ang isang lipi mula sa Israel.”
Rashi
The survivors must inherit the ancestral property The tribe's ancestral property remains unclaimed; let us devise a plan whereby they may father children, so that the property will fall into the possession of the remaining survivors, and a tribe will not be obliterated from Yisroel.