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
"It is too bad for you blind leaders who say that whoever takes an oath 'by the Temple,' it does not [really] mean anything, but whoever takes an oath 'by the gold of the Temple,' he is obligated to [fulfill] the oath.

Because

Matthew 6:27
And which one of you can worry yourself into living a single day longer?
Luke 12:25
And which one of you can worry yourself into living a single day longer?

General references

Luke 12:25
And which one of you can worry yourself into living a single day longer?