TgO Lev6:6 :אִישָתָא תְדִירָא תְהֵי יָקְדָא עַל מַדבְחָא לָא תִטפֵי‏ : an everlasting fire shall burn on the altar, it shall not be extinguished
See the entire entry for ṭpy vb. to die out, be extinguished