Strong G4337 προσέχω prosechō · to watch out

Hebrews

1. Hebrews 2:1
   Therefore we ought to give the more earnest heed to the things which we have heard, lest at any time we should let them slip.
2. Hebrews 7:13
   For he of whom these things are spoken pertaineth to another tribe, of which no man gave attendance at the altar.