“If a man vows a vow to the Lord ... he shall not break his word” (30:2). As well as collective worship, individuals could make vows (29:39) to the Lord that often included either special offerings, promises, or acts of self-denial. These vows were sacred between worshiper and God. However, women embedded in family relationships needed a father or husband’s approval for their vows. This prevented vows (promises/offerings) from conflicting with family life and gave women a way out of obligations that caused tensions. Widows and divorced women had to fulfill all their vows, like men (30:9). 

God cares about our individual relationship with him and how our spiritual lives and choices affect those around us. “So then let us pursue what makes for peace and for mutual upbuilding” (Rom 14:19).