1 Samuel 21:4-6

4And the priest answered David, and said, There is no common bread under mine hand, but there is holy bread; if only the young men have kept themselves from women.

5And David answered the priest, and said unto him, Of a truth 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?

6So the priest gave him holy bread: for there was no bread there but the shewbread, that was taken from before the LORD, to put hot bread in the day when it was taken away.