"If you happen to come upon a bird's nest along the way, in any tree or on the ground, with young ones or eggs, and the mother sitting on the young or on the eggs, you shall not take the mother with the young;" (Deuteronomy 22:6)
"you shall certainly let the mother go, but the young you may take for yourself, in order that it may be well with you and that you may prolong your days." (Deuteronomy 22:7)
"You shall be careful to perform what goes out from your lips, just as you have voluntarily vowed to the LORD your God, what you have promised." (Deuteronomy 23:23)
"If a man makes a vow to the LORD, or takes an oath to bind himself with a binding obligation, he shall not violate his word; he shall do according to all that proceeds out of his mouth." (Numbers 30:2)