Matthew 5:36

Never swear by your own head, for you cannot make a single hair white or black.

Matthew 6:27

But which of you by worrying can add a single minute to his life?

Matthew 23:16-21

A curse on you, you blind leaders who say, 'Whoever swears by the sanctuary is not duty-bound, but whoever swears by the gold of the sanctuary is duty-bound.'

Luke 12:25

Which of you by worrying can add a single minute to his 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
A curse on you, you blind leaders who say, 'Whoever swears by the sanctuary is not duty-bound, but whoever swears by the gold of the sanctuary is duty-bound.'

Because

Matthew 6:27
But which of you by worrying can add a single minute to his life?
Luke 12:25
Which of you by worrying can add a single minute to his life?

General references

Luke 12:25
Which of you by worrying can add a single minute to his life?