horkos

(Translation from NRSV)

Matthew

5: 33	"Again, you have heard that it was said to those of ancient times, 'You shall not swear falsely, but carry out the oaths (horkos) you have made to the Lord.'
14: 7	so much that he promised on oath (horkos) to grant her whatever she might ask.
14: 9	The king was grieved, yet out of regard for his oaths (horkos) and for the guests, he commanded it to be given;
26: 72	Again he denied it with an oath (horkos), "I do not know the man."

Mark

6: 26

The king was deeply grieved; yet out of regard for his oaths (horkos) and for the guests, he did not want to refuse her.

Luke

1: 73

the oath (horkos) that he swore to our ancestor Abraham, to grant us

Acts

2: 30

Since he was a prophet, he knew that God had sworn with an oath (horkos) to him that he would put one of his descendants on his throne.