'Take Heed' in the Bible

If ye will not hear it, nor regard it, to give the glory unto my name, sayeth the LORD of Hosts, I will send a curse upon you, and will curse your blessings. Yea, curse them will I if ye do not take heed.

And did not he make one? Yet had he the residue of the spirit. And wherefore one? That he might seek a godly seed. Therefore take heed to your spirit, and let none deal treacherously against the wife of his youth.

For the LORD, the God of Israel, saith that he hateth putting away: for one covereth violence with his garment, saith the LORD of hosts: therefore take heed to your spirit, that ye deal not treacherously.