Communion gives spiritual strength for your battles with the enemy. While hiding out from Saul David and his small group of men ran out of food (provisions). David arranged to meet them somewhere and he went to find some food. He went to Nob ( a community of priests) and asked Ahimelech for food.
I Samuel 21:3-5 NKJV
“ ‘Now therefore, what have you on hand? Give me five loaves of bread in my hand, or whatever can be found.’ And the priest answered David and said, ‘There is no common bread on hand; but there is holy bread, if the young men have kept themselves from women.’
The David answered the priest, and said to him, ‘Truly, women have been kept from us about three days since I came out. And the vessels of the young men are holy, and the bread is in effect common, even though it was consecrated in the vessel this day.’ ”
The priest gave David the shewbread. It became their “bread of strength.”
I Samuel 21:6 NKJV
“So the priest gave him holy bread; for there was no bread there but the showbread which had been taken from before the Lord, in order to put hot bread in its place on the day when it was taken away.”
It was not lawful for anyone other than the priest to eat the shewbread but the priest realized that it was important to keep the spirit of the law.
Matthew 12:3-4 NKJV
“But He said to them, ‘Have you not read what David did when he was hungry, he and those with him: how they entered the house of God and ate the showbread which was not lawful for him to eat, nor for those who were with him, but only for the priests?”
If you are like David’s men (you are fighting a battle and seem to be growing weaker) you need to receive communion.
When the Hebrews left Egypt there was not one feeble, sick, lame or weak person among them. This was because of what they had done the night before. They had received “communion” the night before. They had eaten the Passover lamb and applied it’s blood to their house.
Psalm 105:37 NKJV
“He brought them out with silver and gold,
And there was none feeble among His tribes.”