'Oath' in the Bible

And the moment he saw her, he tore his clothes and said, "Ah! My daughter, you have caused me to bow down, and you have become my trouble. {I made an oath} to Yahweh, and I cannot take [it] back."

She said to him, "My father, {you made an oath} to Yahweh. Do to me according to what has gone out from your mouth, since Yahweh gave vengeance to you against your enemies, the {Ammonites}."

And the {Israelites} said, "Who in the assembly has not come up from all the tribes of Israel to Yahweh?" For a solemn oath was [taken] concerning whoever did not come up to Yahweh at Mizpah, saying, "He will certainly be put to death."