London Baptist Confession Chapter 27 - 29

Of the Communion of Saints
Chapter 27—
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All saints that are united to Jesus Christ, their head, by his Spirit, and faith, although they are not made thereby one person with him, have fellowship in his graces, sufferings, death, resurrection, and glory;1 and, being united to one another in love, they have communion in each others gifts and graces,2 and are obliged to the performance of such duties, public and private, in an orderly way, as do conduce to their mutual good, both in the inward and outward man.31 1 John 1:3; John 1:16; Phil. 3:10; Rom. 6:5–62 Eph. 4:15–16; 1 Cor. 12:7; 3:21–233 1 Thess. 5:11,14; Rom. 1:12; 1 John 3:17–18; Gal. 6:10—

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Saints by profession are bound to maintain a holy fellowship and communion in the worship of God, and in performing such other spiritual services as tend to their mutual edification;4 as also in relieving each other in outward things according to their several abilities, and necessities;5 which communion, according to the rule of the gospel, though especially to be exercised by them, in the relation wherein they stand, whether in families,6 or churches,7 yet, as God offers opportunity, is to be extended to all the household of faith, even all those who in every place call upon the name of the Lord Jesus; nevertheless their communion one with another as saints, does not take away or infringe the title or propriety which each man has in his goods and possessions.84 Heb. 10:24–25, 3:12–135 Acts 11:29–306 Eph. 6:47 1 Cor. 12:14–278 Acts 5:4; Eph. 4:28

Of Baptism and the Lord's SupperChapter 28—

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Baptism and the Lord's Supper are ordinances of positive and sovereign institution, appointed by the Lord Jesus, the only lawgiver, to be continued in his church to the end of the world.11 Matt. 28:19–20; 1 Cor. 11:26—

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These holy appointments are to be administered by those only who are qualified and thereunto called, according to the commission of Christ.22 Matt. 28:19; 1 Cor. 4:1

Of Baptism
Chapter 29—

Paragraph 1Baptism is an ordinance of the New Testament, ordained by Jesus Christ, to be unto the party baptized, a sign of his fellowship with him, in his death and resurrection; of his being engrafted into him;1 of remission of sins;2 and of giving up into God, through Jesus Christ, to live and walk in newness of life.31 Rom. 6:3–5; Col. 2:12; Gal. 3:272 Mark 1:4; Acts 22:163 Rom. 6:4—
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Those who do actually profess repentance towards God, faith in, and obedience to, our Lord Jesus Christ, are the only proper subjects of this ordinance.44 Mark 16:16; Acts 8:36–37, 2:41, 8:12, 18:8—
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The outward element to be used in this ordinance is water, wherein the party is to be baptized, in the name of the Father, and of the Son, and of the Holy Spirit.55 Matt. 28:19–20; Acts 8:38—
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Immersion, or dipping of the person in water, is necessary to the due administration of this ordinance.66 Matt. 3:16; John 3:23