'Perform' in the Bible

Not for thy righteousness, or for the uprightness of thy heart, dost thou enter in to possess their land, but for the wickedness of these nations doth Jehovah thy God dispossess them from before thee, and that he may perform the word which Jehovah swore unto thy fathers, to Abraham, to Isaac, and to Jacob.

When thou vowest a vow to Jehovah thy God, thou shalt not delay to perform it; for Jehovah thy God will certainly require it of thee, and it shall be sin in thee.

If brethren dwell together, and one of them die, and have no son, the wife of the dead shall not marry a stranger abroad: her husband's brother shall go in unto her, and take her to him as wife, and perform the duty of a husband's brother unto her.

But if the man like not to take his brother's wife, his brother's wife shall go up to the gate unto the elders, and say, My husband's brother refuseth to raise up unto his brother a name in Israel: he will not perform for me the duty of a husband's brother.