Хасидус к Берешит 49:5

8. It is a segulah (auspicious),when one moves into a new house to live, to bring in a sword, knife, or other weapon. A sign for this: "With wisdom the house will be built. (Mishlei -- Proverbs 24:3)" "Wisdom" is the acronym for the passage, "Extorted trade are their weapons.” (Bereshit 49:5)." The word "their trade" from this passage shares two definitions, "their swords" and "their dwellings" (as both variations are explained in Rashi there, t.n.).

10. Upon entering a new house in which to live, it is a segulah to bring in a sword, knife or other weapon. An indication for this (from Scripture): "Through wisdom a house is built" -- the letters of "wisdom" (ChuChMah) stand for "Weapons of Violence they practice where they Reside (Bereshit 49:5)". Their swords, their residence (the Hebrew word in the verse which was translated as “their residence” can be alternately translated: "their swords" (in which case the “weapons of violence” would be translated as, stolen weapons, see Rashi there)). [t.n. Thus a connection between weapons and the maintaining of residence can be established].