Matthew 5:36

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

Matthew 6:27

Which of you, though he took thought therefore, could put one cubit unto his stature?

Matthew 23:16-21

Woe be unto you, blind guides, for ye which say, 'Whosoever swear by the temple, it is nothing: but whosoever swear by the gold of the temple, he offendeth.'

Luke 12:25

Which of you with taking thought can add to his stature one cubit?

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 be unto you, blind guides, for ye which say, 'Whosoever swear by the temple, it is nothing: but whosoever swear by the gold of the temple, he offendeth.'

Because

Matthew 6:27
Which of you, though he took thought therefore, could put one cubit unto his stature?
Luke 12:25
Which of you with taking thought can add to his stature one cubit?

General references

Luke 12:25
Which of you with taking thought can add to his stature one cubit?