אַל־תַּהַרְגֵ֤ם ׀ פֶּֽן־יִשְׁכְּח֬וּ עַמִּ֗י הֲנִיעֵ֣מוֹ בְ֭חֵילְךָ וְהוֹרִידֵ֑מוֹ מָֽגִנֵּ֣נוּ אֲדֹנָֽי׃
Rashi on Psalms
Do not kill them because this is not recognizable [as] revenge.
Rashi on Psalms
lest my people forget because all the dead are forgotten. Instead, deprive them of their possessions, so that they are impoverished. That is the revenge that will be long remembered.