John 3:5

Of water and of the Spirit - To the baptism of water a man was admitted when he became a proselyte to the Jewish religion; and, in this baptism, he promised in the most solemn manner to renounce idolatry, to take the God of Israel for his God, and to have his life conformed to the precepts of the Divine law. But the water which was used on the occasion was only an emblem of the Holy Spirit. The soul was considered as in a state of defilement, because of past sin: now, as by that water the body was washed, cleansed, and refreshed, so, by the influences of the Holy Spirit, the soul was to be purified from its defilement, and strengthened to walk in the way of truth and holiness.

When John came baptizing with water, he gave the Jews the plainest intimations that this would not suffice; that it was only typical of that baptism of the Holy Ghost, under the similitude of fire, which they must all receive from Jesus Christ: see Matthew 3:11. Therefore, our Lord asserts that a man must be born of water and the Spirit, i.e. of the Holy Ghost, which, represented under the similitude of water, cleanses, refreshes, and purifies the soul. Reader, hast thou never had any other baptism than that of water? If thou hast not had any other, take Jesus Christ's word for it, thou canst not, in thy present state, enter into the kingdom of God. I would not say to thee merely, read what it is to be born of the Spirit: but pray, O pray to God incessantly, till he give thee to feel what is implied in it! Remember, it is Jesus only who baptizes with the Holy Ghost: see John 1:33. He who receives not this baptism has neither right nor title to the kingdom of God; nor can he with any propriety be termed a Christian, because that which essentially distinguished the Christian dispensation from that of the Jews was, that its author baptized all his followers with the Holy Ghost.

Though baptism by water, into the Christian faith, was necessary to every Jew and Gentile that entered into the kingdom of the Messiah, it is not necessary that by water and the Spirit (in this place) we should understand two different things: it is probably only an elliptical form of speech, for the Holy Spirit under the similitude of water; as, in Matthew 3:3, the Holy Ghost and fire, do not mean two things, but one, viz. the Holy Ghost under the similitude of fire - pervading every part, refining and purifying the whole.

Be born of water - By "water," here, is evidently signified "baptism." Thus the word is used in Ephesians 5:26; Titus 3:5. Baptism was practiced by the Jews in receiving a Gentile as a proselyte. It was practiced by John among the Jews; and Jesus here says that it is an ordinance of his religion, and the sign and seal of the renewing influences of his Spirit. So he said Mark 16:16, "He that believeth and is baptized shall be saved." It is clear from these places, and from the example of the apostles Act 2:38, Acts 2:41; Acts 8:12-13, Acts 8:36, Acts 8:38; Acts 9:18; Acts 10:47-48; Acts 16:15, Acts 16:33; Acts 18:8; Acts 22:16; Galatians 3:27, that they considered this ordinance as binding on all who professed to love the Lord Jesus. And though it cannot be said that none who are not baptized can be saved, yet Jesus meant, undoubtedly, to be understood as affirming that this was to be the regular and uniform way of entering into his church; that it was the appropriate mode of making a profession of religion; and that a man who neglected this, when the duty was made known to him, neglected a plain command of God. It is clear, also, that any other command of God might as well be neglected or violated as this, and that it is the duty of everyone not only to love the Saviour, but to make an acknowledgment of that love by being baptized, and by devoting himself thus to his service.

But, lest Nicodemus should suppose that this was all that was meant, he added that it was necessary that he should "be born of the Spirit" also. This was predicted of the Saviour, that he should "baptize with the Holy Ghost and with fire," Matthew 3:11. By this is clearly intended that the heart must be changed by the agency of the Holy Spirit; that the love of sin must be abandoned; that man must repent of crime and turn to God; that he must renounce all his evil propensities, and give himself to a life of prayer and holiness, of meekness, purity, and benevolence. This great change is in the Scripture ascribed uniformly to the Holy Spirit, Titus 3:5; 1 Thessalonians 1:6; Romans 5:5; 1 Peter 1:22.

Cannot enter into - This is the way, the appropriate way, of entering into the kingdom of the Messiah here and hereafter. He cannot enter into the true church here, or into heaven in the world to come, except in connection with a change of heart, and by the proper expression of that change in the ordinances appointed by the Saviour.

3:5 Except a man be born of water and of the Spirit - Except he experience that great inward change by the Spirit, and be baptized (wherever baptism can be had) as the outward sign and means of it.