Job 20:12 Halakhah

אִם־תַּמְתִּ֣יק בְּפִ֣יו רָעָ֑ה יַ֝כְחִידֶ֗נָּה תַּ֣חַת לְשׁוֹנֽוֹ׃

Though wickedness be sweet in his mouth, Though he hide it under his tongue;