Adam Clarke on Acts 16:34

He set meat before them - They were sufficiently exhausted, and needed refreshment; nor had the apostles any such inherent miraculous power as could prevent them from suffering through hunger, or enable them to heal their own grounds. As they were the instruments of bringing health to his soul, he became the instrument of health to their bodies. Genuine faith in Christ will always be accompanied with benevolence and humanity, and every fruit that such dispositions can produce. The jailor believed - brought them into his house - washed their stripes - and set meat before them.