Romans 6:4

“Therefore we are buried with him by baptism into death, etc..] The nature and end of baptism are here expressed; the nature of it, it is a “burial”; and when the apostle so calls it, he manifestly refers to the ancient and only way of administering this ordinance, by immersion; when a person is covered, and as it were buried in water, as a corpse is when laid the earth, and covered with it: and it is a burial with Christ; it is a representation of the burial of Christ, and of our burial with him as our head and representative, and that “into death”; meaning either the death of Christ as before, that is, so as to partake of the benefits of his death; or the death of sin, of which baptism is…”

“Therefore we are--rather, "were" (it being a past act, completed at once). buried with him, by baptism into death--(The comma we have placed after "him" will show what the sense is. It is not, "By baptism we are buried with Him into death," which makes no sense at all; but, "By baptism with Him into death we are buried with Him"; in other words, "By the same baptism which publicly enters us into His death, we are made partakers of His burial also"). To leave a dead body unburied is represented, alike in heathen authors as in Scripture, as the greatest indignity (Rev 11:8-9). It was fitting, therefore, that Christ, after "dying for our sins according to the Scriptures," should "descend into…”

“Therefore we are buried ... - It is altogether probable that the apostle in this place had allusion to the custom of baptizing by immersion. This cannot, indeed, be proved, so as to be liable to no objection; but I presume that this is the idea which would strike the great mass of unprejudiced readers. But while this is admitted, it is also certain that his main scope and intention was not to describe the mode of baptism; nor to affirm that that mode was to be universal. The design was very different. It was to show that by the solemn profession made at our baptism, we had become dead to sin, as Christ was dead to the living world around him when he was buried; and that as he was raised up…”

“We are buried with him - Alluding to the ancient manner of baptizing by immersion. That as Christ was raised from the dead by the glory - Glorious power. Of the Father, so we also, by the same power, should rise again; and as he lives a new life in heaven, so we should walk in newness of life. This, says the apostle, our very baptism represents to us. Romans 6:5”

“6:4 we died and were buried with Christ: The believer’s power over sin and the ability to lead a new life stem from identification with Christ’s death, burial, and resurrection (see 6:5, 8). From God’s perspective, Jesus’ death to sin (see 6:10) is ours as well. His rising to new life means that we also begin to lead a new life, and in the future our bodies will also be raised.”

“we are: Rom 6:3; Col 2:12, Col 2:13, Col 3:1-3; Pe1 3:21 that: Rom 6:9, Rom 8:11; Co1 6:14; Co2 13:4; Eph 1:19, Eph 1:20, Eph 2:5, Eph 2:6 by the: Mat 28:2, Mat 28:3; Joh 2:11, Joh 2:19, Joh 2:20, Joh 11:40; Col 1:11 even: Rom 6:19, Rom 7:6, Rom 12:1, Rom 12:2, Rom 13:13, Rom 13:14; Co2 5:17; Gal 6:15, Gal 6:16; Eph 4:17, Eph 4:22-24, Eph 5:8; Phi 3:17, Phi 3:18; Col 1:9-12, Col 2:11, Col 2:12, Col 3:10, Col 4:1; Pe1 4:1, Pe1 4:2; Pe2 1:4-9; Jo1 2:6 Romans 6:5”