Matthew 5:36

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

Matthew 6:27

who by all his sollicitude can add one moment to his age?

Matthew 23:16-21

wo unto you, ye blind guides, who say, if any man swear by the temple he is under no obligation: but if he swear by the gold of the temple, he is bound by his oath.

Luke 12:25

but which of you, with all his disquietude, can add one moment to the period of his life?

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 unto you, ye blind guides, who say, if any man swear by the temple he is under no obligation: but if he swear by the gold of the temple, he is bound by his oath.

Because

Matthew 6:27
who by all his sollicitude can add one moment to his age?
Luke 12:25
but which of you, with all his disquietude, can add one moment to the period of his life?

General references

Luke 12:25
but which of you, with all his disquietude, can add one moment to the period of his life?