שׁמד shmd "destroy, exterminate" In Amos at 2:9 and 9:8 in balancing forms:

• at 2:9 a hiphil perfect 1cs and a hiphil vav-converted 1cs both imperfect indicating past action "I destroyed"
• at 9:8 a vav-converted hiphil perfect 1cs indicating future action "I will destroy".
  In the past Adonai destroyed Israel's enemies, in the future Israel will be destroyed.