This is a variant of "The Silver Dagger" (Laws #G21). See The Traditional Ballad Index: Silver Dagger. Another version from Alabama (Byron Arnold, Folksongs of Alabama, University of Alabama Press, 1950, p. 75; with music).

KATIE DEAR

1 "Oh, Katie, dear, go ask your mother,
Ask her if you my bride may be,
And if she denies you, love, come and tell me
Then that'll be the last I'll trouble thee."

2 "Oh, Willie, dear, that would be useless.
She's in her room taking her rest
And by her side lies a silver dagger
To plunge into my true love's breast."

3 "Oh, Katie, dear, go ask your father,
Ask him if you my bride may be,
And if he denies you, love, come and tell me,
And that'll be the last I'll trouble thee."

4 "Oh, Willie, dear, that would be folly;
He's in his room taking his rest,
And by his side lies a golden dagger
To plunge into my true love's breast."

5 "Then don't you see that cloud a rising
To shield us from the rising sun;
Oh, won't you be glad my own true lover
When you and I become as one?"

~Masato