Matthew 5:36

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

Matthew 6:27

But which of you, by his cares, can add one cubit to his stature?

Matthew 23:16-21

Wo unto you ye blind guides! who say, Whosoever shall swear by the temple, it is nothing; but whosoever shall swear by the gold of the temple, it is binding.

Luke 12:25

Which of you, with all his anxiety, can add one moment 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
Wo unto you ye blind guides! who say, Whosoever shall swear by the temple, it is nothing; but whosoever shall swear by the gold of the temple, it is binding.

Because

Matthew 6:27
But which of you, by his cares, can add one cubit to his stature?
Luke 12:25
Which of you, with all his anxiety, can add one moment to his life?

General references

Luke 12:25
Which of you, with all his anxiety, can add one moment to his life?