Hesabu 30 : 2 Numbers chapter 30 verse 2

Mtu atakapomwekea Bwana nadhiri, au, atakapoapa kiapo ili kufunga nafsi yake kwa kifungo, asilitangue neno lake; atafanya sawasawa na hayo yote yamtokayo kinywani mwake.
soma Mlango wa 30

When a man vows a vow to Yahweh, or swears an oath to bind his soul with a bond, he shall not break his word; he shall do according to all that proceeds out of his mouth.