Matthew 5:36

Neither shall you swear by your head, for you can't make one hair white or black.

Matthew 6:27

"Which of you, by being anxious, can add one moment to his lifespan?

Matthew 23:16-21

"Woe to you, you blind guides, who say, 'Whoever swears by the temple, it is nothing; but whoever swears by the gold of the temple, he is obligated.'

Luke 12:25

Which of you by being anxious can add a cubit to his height?

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, you blind guides, who say, 'Whoever swears by the temple, it is nothing; but whoever swears by the gold of the temple, he is obligated.'

Because

Matthew 6:27
"Which of you, by being anxious, can add one moment to his lifespan?
Luke 12:25
Which of you by being anxious can add a cubit to his height?

General references

Luke 12:25
Which of you by being anxious can add a cubit to his height?