John Trapp on Psalms 10:7

Verſ. 7. His mouth is full of curſing and deceit] Such curſing men are curſed men; and for ſuch ſlippery and deceitful perſons, the Lord is the avenger of all ſuch; 1 Theſſ. 4.8.

Ʋnder his tongue is miſchief] that is, in his heart, which is by Nature placed beneath the Tongue, making its uſe of it, for much miſchief, Matth. 12.34. Jam. 3.8. The word Toch here rendred fraud, ſignifieth properly the middle of any thing, Quoniam fraus in modio cordis eſt, ſaith R. David, becauſe fraud is in the middle of the heart, and there-hence ſent into the mouth.