Psalms 10:7

7. Cursing… deceit… fraud The word “cursing” may be rendered false swearing, as in Hosea 10:4; connected with lying, (Hosea 4:2, Psalms 59:12,) or execration, invoking a curse upon others; or it may mean an oath with a curse or imprecation added to sanction the statement, as in Numbers 5:21-22. The first seems to be the true sense. “Deceit,” Hebrew, deceits; the plural for intensity. This applies to the external false show and promise of his words. “Fraud;” the internal guile, the falsity of his intentions.

Under his tongue Words under the tongue are words concealed, as yet unspoken, but ready for an occasion. Some suppose an allusion is here made to the poison sac of the serpent, which lies at the root of the fang tooth. See Job 20:12-13.

Mischief and vanity Literally, labour and iniquity, as if he were in restless toil of secreting and fashioning wicked and deceitful words.