Had fasted - Abstained from food.
Forty days and forty nights - It has been questioned by some whether Christ abstained wholly from food, or only from the food to which he was accustomed. Luke says Luke 4:2 that he ate nothing. This settles the question. Mark says Mark 1:13 that angels came and ministered unto him. At first view this would seem to imply that he did eat during that time. But Mark does not mention the time when the angels performed this office of kindness, and we are at liberty to suppose that he means to say that it was done at the close of the 40 days; and the rather as Matthew, after giving an account of the temptation, says the same thing Matthew 4:2. There are other instances of persons fasting 40 days recorded in the Scriptures. Thus, Moses fasted 40 days, Exodus 34:28. Elijah also fasted the same length of time, 1-Kings 19:8. In these cases they were no doubt miraculously supported.

And when he had fasted forty days - It is remarkable that Moses, the great lawgiver of the Jews, previously to his receiving the law from God, fasted forty days in the mount; that Elijah, the chief of the prophets, fasted also forty days; and that Christ, the giver of the New Covenant, should act in the same way. Was not all this intended to show, that God's kingdom on earth was to be spiritual and Divine? - that it should not consist in meat and drink, but in righteousness, peace, and joy in the Holy Ghost? Romans 14:17. Relative to the forty days' fast of Moses, there is a beautiful saying in the Talmudists. "Is it possible that any man can fast forty days and forty nights? To which Rabbi Meir answered, When thou takest up thy abode in any particular city, thou must live according to its customs. Moses ascended to heaven, where they neither eat nor drink therefore he became assimilated to them. We are accustomed to eat and drink; and, when angels descend to us, they eat and drink also."
Moses, Elijah, and our blessed Lord could fast forty days and forty nights, because they were in communion with God, and living a heavenly life.

And when he had fasted (a) forty days and forty nights, he was afterward an hungred.
(a) A full forty days.

And when he had fasted forty days..... As Moses did, when he was about to deliver the law to the Israelites, Exodus 34:28 and as Elijah did, when he bore his testimony for the Lord of hosts, 1-Kings 19:8 so did Christ, when he was about to publish the Gospel of his grace, and bear witness to the truth. "Forty nights" as well as days, are mentioned; partly to show that these were whole entire days, consisting of twenty four hours; and partly to distinguish this fast of Christ from the common fastings of the Jews, who used to eat in the night, though they fasted in the day: for according to their canons (z), they might eat and drink as soon as it was dark, and that till cock crowing; and others say, till break of day. Maimonides (a) says, they might eat and drink at night, in all fasts, except the ninth of Ab. What is very surprising in this fasting of our Lord, which was made and recorded, not for our imitation, is, that during the whole time he should not be attended with hunger; for it is added,
he was afterwards an hungered; that is, as Luke says, "when" the "forty" days "were ended", Luke 4:2 which seized upon him, and is related, both to express the reality of his human nature, which though miraculously supported for so long a time without food, and insensible of hunger, yet at length had appetite for food; and also that very advantageous opportunity Satan had to attack him in the manner he did, with his first temptation.
(z) T. Bab. Taanith, fol. 12. 1, 2. Misn. Taanith, c. 1. sect. 5. (a) Hilch. Taanith, c. 5. sect. 5.

And when he had fasted forty days and forty nights--Luke says "When they were quite ended" (Luke 4:2).
he was afterward an hungered--evidently implying that the sensation of hunger was unfelt during all the forty days; coming on only at their close. So it was apparently with Moses (Exodus 34:28) and Elijah (1-Kings 19:8) for the same period. A supernatural power of endurance was of course imparted to the body, but this probably operated through a natural law--the absorption of the Redeemer's Spirit in the dread conflict with the tempter. (See on Acts 9:9). Had we only this Gospel, we should suppose the temptation did not begin till after this. But it is clear, from Mark's statement, that "He was in the wilderness forty days tempted of Satan" (Mark 1:13), and Luke's, "being forty days tempted of the devil" (Luke 4:2), that there was a forty days' temptation before the three specific temptations afterwards recorded. And this is what we have called the First Stage. What the precise nature and object of the forty days' temptation were is not recorded. But two things seem plain enough. First, the tempter had utterly failed of his object, else it had not been renewed; and the terms in which he opens his second attack imply as much. But further, the tempter's whole object during the forty days evidently was to get Him to distrust the heavenly testimony borne to Him at His baptism as THE SON OF GOD--to persuade Him to regard it as but a splendid illusion--and, generally, to dislodge from His breast the consciousness of His Sonship. With what plausibility the events of His previous history from the beginning would be urged upon Him in support of this temptation it is easy to imagine. And it makes much in support of this view of the forty days' temptation that the particulars of it are not recorded; for how the details of such a purely internal struggle could be recorded it is hard to see. If this be correct, how naturally does the SECOND STAGE of the temptation open! In Mark's brief notice of the temptation there is one expressive particular not given either by Matthew or by Luke--that "He was with the wild beasts" (Mark 1:12), no doubt to add terror to solitude, and aggravate the horrors of the whole scene.

When he had fasted forty days and forty nights. Moses and Elijah each fasted for the same length of time. It was a period of spiritual exaltation, of meditation and prayer, of preparation for his work, and it is hardly probable that he felt the need of food.
He was afterward an hungered. At the close of this period nature began to assert her demands, and hunger was keenly felt.

Having fasted - Whereby doubtless he received more abundant spiritual strength from God. Forty days and forty nights - As did Moses, the giver of the law, and Elijah, the great restorer of it. He was afterward hungry - And so prepared for the first temptation.