Matthew 5:36

nor by thy head mayest thou swear, because thou art not able one hair to make white or black;

Matthew 6:27

'And who of you, being anxious, is able to add to his age one cubit?

Matthew 23:16-21

Woe to you, blind guides, who are saying, Whoever may swear by the sanctuary, it is nothing, but whoever may swear by the gold of the sanctuary -- is debtor!

Luke 12:25

and who of you, being anxious, is able to add to his age 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 to you, blind guides, who are saying, Whoever may swear by the sanctuary, it is nothing, but whoever may swear by the gold of the sanctuary -- is debtor!

Because

Matthew 6:27
'And who of you, being anxious, is able to add to his age one cubit?
Luke 12:25
and who of you, being anxious, is able to add to his age one cubit?

General references

Luke 12:25
and who of you, being anxious, is able to add to his age one cubit?