James 5:12
But above all things, my brothers, swear not, neither by heaven, neither by the earth, neither by any other oath: but let your yes be yes; and your no, no; lest you fall into condemnation.
Topicalbible.org—AKJV

Ecclesiastes 5:5
Better is it that you should not vow, than that you should vow and not pay.
Topicalbible.org—AKJV