So the priest gave him hallowed 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. So the priest gave him hallowed bread - To this history our Lord alludes, Mark 2:25, in order to show that in cases of absolute necessity a breach of the ritual law was no sin. It was lawful for the priests only to eat the shew-bread; but David and his companions were starving, no other bread could be had at the time, and therefore he and his companions ate of it without sin.
Related Commentaries of 1 Samuel 21:6
1 Samuel 21:6
6 So the priest gave him hallowed 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.