Deuteronomy 8:10

Bless the Lord Solemnly praise him for thy food; which is a debt both of gratitude and justice, because it is from his providence and favour that thou receivest both thy food and refreshment, and strength by it. The more unworthy and absurd is that too common profaneness of them, who, professing to believe in God, from whom all their comforts come, grudge to own him at their meals, either by desiring his blessing before them, or by offering due praise to God after them.