Reference for I Samuel 13:20

וַיֵּרְד֥וּ כָל־יִשְׂרָאֵ֖ל הַפְּלִשְׁתִּ֑ים לִ֠לְטוֹשׁ אִ֣ישׁ אֶת־מַחֲרַשְׁתּ֤וֹ וְאֶת־אֵתוֹ֙ וְאֶת־קַרְדֻּמּ֔וֹ וְאֵ֖ת מַחֲרֵשָׁתֽוֹ׃

but all the Israelites went down to the Philistines, to sharpen every man his plowshare, and his coulter, and his axe, and his mattock.