1st Corinthians 7: 5 Defraud ye not one the other, except it be with consent for a time, that ye may give yourselves to fasting and prayer; and come together again, that Satan tempt you not for your incontinency.
Neither does God encourage long periods of fasting that last forty or more days, for doing so may open the door for the devil to tempt persons in unusual ways. Excessive fasting without any food or drink for weeks on end is never in the best interest of anyone except Christ, who did that to break the power of appetite on the human family.
But having done so, it is no longer necessary. What Christ did for us in the wilderness does not need to be duplicated or matched by any saint, for He has already done what needed to be done in our behalf. That is not to say that we should never fast, but we should exercise wisdom and prudence when doing so.
[Counsels on diets and foods pp 189] All the fasting in the world will not take the place of simple trust in the word of God. “Ask,” He says, “and you shall receive.” You are not called upon to fast forty days. The Lord bore that fast for you in the wilderness of temptation. There would be no virtue in such a fast; but there is virtue in the blood of Christ. The spirit of true fasting and prayer is the spirit which yields mind, heart, and will to God.
Matthew 9:14 Then came to him the disciples of John, saying, Why do we and the Pharisees fast oft, but thy disciples fast not? 15 And Jesus said unto them, Can the children of the bridechamber mourn, as long as the bridegroom is with them? but the days will come, when the bridegroom shall be taken from them, and then shall they fast.
May God add His blessing to the study of His word. “Good night” and God bless!