make a vow
take a vow

But I made a vow to be around and keep my eyes open.

You made a vow you'd never go back, and you're going to keep it.

Maybe we'd better make a vow just to stay friends.

After the experiences of the last few days, he'd made a vow to make every effort not to get behind again.

And so she had made a small, private vow to herself.

She made a vow not to think about her mother for a while.

She'd made a vow to do her best to make this marriage work.

But before all of that, he had made a vow.

Again, she made a vow to start an exercise program.

At one time West had made a vow never to take another life.