25. turn . . . hand--not in wrath, but in grace (Zec 13:7), "upon thee," as Isa 1:26, 27 show; contrasted with the enemies, of whom He will avenge Himself (Isa 1:24).
      purely--literally, "as alkali purifies."
      thy dross--not thy sins, but the sinful persons (Jer 6:29); "enemies" (Isa 1:24); degenerate princes (see on Isa 1:22), intermingled with the elect "remnant" of grace.
      tin--Hebrew, bedil, here the alloy of lead, tin, &c., separated by smelting from the silver. The pious Bishop Bedell took his motto from this.

JFB.