N.J. Stat. Ann. § 2A:17-39

Whereas, other judgments, and recognizances, besides those, or some of those, by virtue whereof the sale aforesaid was made, might affect the real estate so sold, if no provision be made to remedy the same, and whereas, the persons who have not taken, or will not take out executions upon their judgments, or recognizances, ought not to hinder or prevent such as do take out executions from having the proper effect and fruits thereof, therefore, in any such case, the purchaser, his heirs and assigns, shall hold the lands, tenements, hereditaments, and real estate by him or her purchased as aforesaid, free and clear of all other judgments and recognizances, whatsoever, on or by virtue of which no execution has been taken out and executed on the real estate so purchased.