Matthew Poole and continuators on Psalms 140:9

9 As for the head of those that compass me about, let the mischief of their own lips cover them .

Or, beads, the Singular number put for the Plural, as is frequent. By which he understands either, 1. their politick heads, their chiefs or ring-leaders, who were most malicious, and by whom all the rest were supported and stirred▪ up: or, 2. their proper and natural heads, as this word is▪ used v. 7. and this covering of their heads here is opposed to that covering of Davids head there.

Let the mischief which by their calumnies they design against me, fall upon themselves.

Marginal references: Psal. 7. 16. & 94. 23. Prov. 12. 13. & 18. 7.