Quoting Commentary for I Kings 10:16

The extent of their straying they have deepened The extent of their straying they have deepened. I said that anyone who does not go up to Jerusalem on the Pilgrimage festivals transgresses a positive commandment, and they decreed that anyone who does go up to Jerusalem shall be put to death. Hence, they went deeper than I. I.e., they were more stringent than I (Sanhedrin 102a). The word שַחֲטָה, translated as ‘extent’ is an expression similar to זָהָב שָׁחוּט, “malleable gold” (I Kings 10:16) stretched and spun. Jonathan, however, renders it as an expression of slaughtering sacrifices to idols.

Their tongue is a deadly arrow Heb. שחוט, drawn. Comp. (I Kings 10:16) “malleable gold” (שחוט). Also, (Hos. 5:2) “And the extent of their turning away (ושחטה),” (tirer in French), pulling. Another explanation is that it is actually an expression of slaughter (tranchant in French, cutting). In this manner Menahem classified it (Machbereth Menahem p. 172), and in this manner Jonathan rendered it: כּגיר די מחרף, like a sharpened arrow.

to the weapons of the house of the forest They are the three hundred shields and two hundred body shields that Solomon made, and the king placed them in the house of the forest of Lebanon (I Kings 10:16).