TgO Gen3:15 :הוּא יְהֵי דְכִיר מָא דַעֲבַדת לֵיה מִלְקַדמִין וְאַת תְהֵי נָטַר לֵיה לְסוֹפָא‏ : he will remember what you did to him at first and you will remain vengeful against him to the end
See the entire entry for nṭr vb. to watch, guard