1 Samuel 21:5

And David in answer to the priest, said to him, Of a truth we have kept ourselves from women these three days. When I set out on the journey, all the servants were purified (though the journey was on secular affairs) because they were to be holy this day, on account of my provision for it.

And the priest answered David, and said, There are no common loaves under my hand, for I have none but holy loaves: if the young men have been kept at least from women, then they shall eat them.