Reference for Psalms 64:4

אֲשֶׁ֤ר שָׁנְנ֣וּ כַחֶ֣רֶב לְשׁוֹנָ֑ם דָּרְכ֥וּ חִ֝צָּ֗ם דָּבָ֥ר מָֽר׃

Who have whet their tongue like a sword, and have aimed their arrow, a poisoned word;

ספר השרשים