חָלְק֤וּ ׀ מַחְמָאֹ֣ת פִּיו֮ וּֽקֲרָב־לִ֫בּ֥וֹ רַכּ֖וּ דְבָרָ֥יו מִשֶּׁ֗מֶן וְהֵ֣מָּה פְתִחֽוֹת׃
Smoother than cream were the speeches of his mouth, But his heart was war; His words were softer than oil, Yet were they keen-edged swords.
Rashi on Psalms
Smooth were Heb. חלקו, an expression of (above 35:6): “and slippery (וחלקלקות).”
Rashi on Psalms
the buttery words of his mouth Heb. מחמאת, an expression of חמאה butter. The first “mem” is a defective radical in the word, like the “mem” of מעשה and the “mem” of מאמר.