Sanctifying our food through prayer

For every creature of God is good, and nothing is to be rejected, if it be received with thanksgiving: for it is sanctified through the word of God and prayer.
I Timothy 4:4-5

Having mentioned their hypocritical fastings, the apostle takes occasion to lay down the doctrine of the Christian liberty, which we enjoy under the gospel, of using God's good creatures,—that, whereas under the law there was a distinction of meats between clean and unclean (such sorts of flesh they might eat, and such they might not eat), all this is now taken away; and we are to call nothing common or unclean, Acts x. 15.

Here observe,
1. We are to look upon our food as that which God has created; we have it from him, and therefore must use it for him. 2. God, in making those things, had a special regard to those who believe and know the truth, to good Christians, who have a covenant right to the creatures, whereas others have only a common right.
3. What God has created is to be received with thanksgiving. We must not refuse the gifts of God's bounty, nor be scrupulous in making differences where God has made none; but receive them, and be thankful, acknowledging the power of God the Maker of them, and the bounty of God the giver of them: Every creature of God is good, and nothing to be refused, v. 4. This plainly sets us at liberty from all the distinctions of meats appointed by the ceremonial law, as particularly that of swine's flesh, which the Jews were forbidden to eat, but which is allowed to us Christians, by this rule, Every creature of God is good. Observe, God's good creatures are then good, and doubly sweet to us, when they are received with thanksgiving.—For it is sanctified by the word of God and prayer, v. 5. It is a desirable thing to have a sanctified use of our creature-comforts.

Now they are sanctified to us,
(1.) By the word of God; not only his permission, allowing us the liberty of the use of these things, but his promise to feed us with food convenient for us. This gives us a sanctified use of our creature-comforts.

(2.) By prayer, which blesses our meat to us. The word of God and prayer must be brought to our common actions and affairs, and then we do all in faith. Here observe, [1.] Every creature is God's, for he made all. Every beast in the forest is mine (says God), and the cattle upon a thousand hills. I know all the fowls of the mountains, and the wild beasts of the field are mine, Ps. l. 10, 11. [2.] Every creature of God is good: when the blessed God took a survey of all his works, God saw all that was made, and, behold, it was very good, Gen. i. 31. [3.] The blessing of God makes every creature nourishing to us; man lives not by bread alone, but by every word that proceeds out of the mouth of God (Matt. iv. 4), and therefore nothing ought to be refused. [4.] We ought therefore to ask his blessing by prayer, and so to sanctify the creatures we receive by prayer.

Matthew Henry's Commentary on the Whole Bible on I Timothy 4

And so we do not say grace blindly, but with a heart of thanksgiving, enjoying the covenant right of Christian liberty that Christ has offered with His blood. How true and wondrous to know that God's gift of food is doubly sweet for Christians when we receive it with thanksgiving through prayer, because it is sanctified and we are once again reminded that we have been freed from the laws of the Torah and we can have fellowship with God through our Mediator.