John Gill Commentary 1 Kings 17:16

"The jar of meal wasted not, neither did the cruse of oil fail, according to the word of Jehovah, which he spake by Elijah." — 1 Kings 17:16 (ASV)

And the barrel of meal wasted not, neither did the cruse of
oil fail, according to the word of the Lord, which he spoke by Elijah .
] There being a continual increase and supply of both, through the mighty power of God working a continued miracle; just as the loaves and fishes were increased while the disciples were eating, (Matthew 14:19Matthew 14:20) .