John Trapp on Jeremiah 7:29

Ver. 29. Cut off thine haire, O Jeruſalem] In token of greateſt ſorrow and ſervitude, Job 1.20. Eſa. 15.2. Ezek. 27.31. Tu dum ſervus es comam nutris, ſaid he in Ariſtophanes. The world here rendred hair is Nezir, which ſignifieth a crown, and there hence the Nazarites had their name, Num. 6. intimating hereby, haply, that their Votaries ſhould be as little accepted as were their ſacrifices, ver. 21.

And forſaken the generation of his wrath] Who are elſewhere called the people of his curſe, and veſſels of wrath, fitted for deſtruction.