Charles Ellicott Commentary Exodus 23:25

"And ye shall serve Jehovah your God, and he will bless thy bread, and thy water; and I will take sickness away from the midst of thee." — Exodus 23:25 (ASV)

He shall bless thy bread, and thy water—that is, all the food, whether meat or drink, on which they subsisted. It is God’s blessing which makes food healthful to us.

Take sickness away.—Half the sicknesses from which men suffer are directly caused by sin, and would disappear if men led godly, righteous, and sober lives. Others, as plague and pestilence, are scourges sent by God to punish those who have offended Him. If Israel had walked in God’s ways, He would have preserved them from sicknesses of all kinds by a miraculous intervention. (Compare to Deuteronomy 7:15.)