Matthew 5:36

And do not swear by your head, for you cannot make even one hair white or black.

Matthew 6:27

Which of you by worrying can add one cubit to his span of life?

Matthew 23:16-21

"Woe to you, blind guides, who say, 'If any one swears by the temple, it is nothing; but if any one swears by the gold of the temple, he is bound by his oath.'

Luke 12:25

And which of you by worrying can add a single cubit to his span of life?

Treasury of Scripture Knowledge

Summary

Neither shalt thou swear by thy head, because thou canst not make one hair white or black.

General references

Bible References

Shalt

Matthew 23:16
"Woe to you, blind guides, who say, 'If any one swears by the temple, it is nothing; but if any one swears by the gold of the temple, he is bound by his oath.'

Because

Matthew 6:27
Which of you by worrying can add one cubit to his span of life?
Luke 12:25
And which of you by worrying can add a single cubit to his span of life?

General references

Luke 12:25
And which of you by worrying can add a single cubit to his span of life?