If you refrain from making a vow, it will not be sinful.

If a person commits a sin punishable by death and is executed, and you hang the corpse ¹  on a tree,

When you make a vow to the Lord your God you must not delay in fulfilling it, for otherwise he ¹  will surely ²  hold you accountable as a sinner. ³ 

Be careful lest you entertain the wicked thought that the seventh year, the year of cancellation of debts, has almost arrived, and your attitude ¹  be wrong toward your impoverished fellow Israelite ²  and you do not lend ³  him anything; he will cry out to the Lord against you and you will be regarded as having sinned. ⁴ 

A single witness may not testify ¹  against another person for any trespass or sin that he commits. A matter may be legally established ²  only on the testimony of two or three witnesses.

You must not do anything to the young woman – she has done nothing deserving of death. This case is the same as when someone attacks another person ¹  and murders him,

You must pay his wage that very day before the sun sets, for he is poor and his life depends on it. Otherwise he will cry out to the Lord against you, and you will be guilty of sin.