36 Nor shall you swear by your head, because you can not make one hair white or black.
Matthew 5:36 Cross References - RKJNT
Matthew 6:27
27 Which of you by being anxious can add one cubit to the span of his life?
Matthew 23:16-21
16 Woe to you, blind guides, who say, Whoever shall swear by the temple, it is nothing; but whoever shall swear by the gold of the temple, he is a debtor!
17 You blind fools: which is greater, the gold, or the temple that sanctifies the gold?
18 And, Whoever shall swear by the altar, it is nothing; but whoever swears by the gift that is upon it, he is obligated.
19 You blind fools: which is greater, the gift, or the altar that sanctifies the gift?
20 Therefore, whoever shall swear by the altar, swears by it, and by all things on it.
21 And whoever shall swear by the temple, swears by it, and by him who dwells in it.
Luke 12:25
25 And which of you by being anxious can add one cubit to his stature?