'Perform' in the Bible

So He declared to you His covenant which He commanded you to follow, the Ten Commandments; and He wrote them on two tablets of stone.

You shall be careful to perform that [vow] which passes your lips, just as you have made a voluntary vow to the Lord your God, just as you have promised with your own words (mouth).

“If brothers are living together and one of them dies without a son, the widow of the deceased shall not be married outside the family to a stranger. Her husband’s brother shall be intimate with her after taking her as his wife and perform the duty of a husband’s brother to her.

But if the man does not want to marry his brother’s [widowed] wife, then she shall go up to the gate [of the city, where court is held] to the elders, and say, ‘My brother-in-law refuses to continue his brother’s name in Israel; he is not willing to perform the duty of a husband’s brother.’