'Once' in the Bible

Once when Jacob was cooking a stew, Esau came in from the field exhausted.

So now, my son, listen to me. Flee at once to my brother Laban in Haran,

Go at once to Paddan-aram, to the house of Bethuel, your mother’s father. Marry one of the daughters of Laban, your mother’s brother.

Take your brother also, and go back at once to the man.