Matthew 5:36

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

Matthew 6:27

Are ye not much better than they? And which of you by taking thought can add to his age the smallest measure?

Matthew 23:16-21

Wo to 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, he is bound.

Luke 12:25

And which of you by taking thought, can add the least measure to his age?

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 to 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, he is bound.

Because

Matthew 6:27
Are ye not much better than they? And which of you by taking thought can add to his age the smallest measure?
Luke 12:25
And which of you by taking thought, can add the least measure to his age?

General references

Luke 12:25
And which of you by taking thought, can add the least measure to his age?