John 6:13 Therefore they gathered them together, and filled twelve baskets with the fragments of the five barley loaves, which remained over and above them that had eaten.

“He who gives to the poor, lends to the Lord”

The boy had given to the poor, and so had lent to the Lord. And “the Lord is no man’s debtor”. A hundred-fold (?) return on the boy’s investment in the kingdom in a few hours.