Strong H5331 נֵ֫צַח netsach nêtsach · perpetuity

Amos

1. Amos 1:11
   Thus saith the Lord; For three transgressions of Edom, and for four, I will not turn away the punishment thereof; because he did pursue his brother with the sword, and did cast off all pity, and his anger did tear perpetually, and he kept his wrath for ever:
2. Amos 8:7
   The Lord hath sworn by the excellency of Jacob, Surely I will never forget any of their works.