'Truly' in the Bible

David swore moreover, and said, "Your father knows well that I have found favor in your eyes; and he says, 'Don't let Jonathan know this, lest he be grieved:' but truly as Yahweh lives, and as your soul lives, there is but a step between me and death."

David answered the priest, and said to him, "Truly, women have been kept from us about these three days. When I came out, the vessels of the young men were holy, though it was but a common journey. How much more then today shall their vessels be holy?"