Romans 8:38-39: " 38 For I am sure that neither death nor life, nor angels nor rulers, nor things present nor things to come, nor powers, 39 nor height nor depth, nor anything else in all creation, will be able to separate us from the love of God in Christ Jesus our Lord."
Romans 6:5-11: "5 For if we have been united with him in a death like his, we shall certainly be united with him in a resurrection like his. 6 We know that our old self was crucified with him in order that the body of sin might be brought to nothing, so that we would no longer be enslaved to sin. 7 For one who has died has been set free from sin. 8 Now if we have died with Christ, we believe that we will also live with him. 9 We know that Christ, being raised from the dead, will never die again; death no longer has dominion over him. 10 For the death he died he died to sin, once for all, but the life he lives he lives to God. 11 So you also must consider yourselves dead to sin and alive to God in Christ Jesus."
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Both cited passages could be included in "we with Christ are one" in the first verse, and the passage from Romans 6 has some general similarities with the hymn text as a whole, but really, the basis for the hymn is Romans 14:7-9: "7 For none of us lives to himself, and none of us dies to himself. 8 For if we live, we live to the Lord, and if we die, we die to the Lord. So then, whether we live or whether we die, we are the Lord's. 9 For to this end Christ died and lived again, that he might be Lord both of the dead and of the living." The hymn's first verse paraphrases verses 7-8, and the second verse paraphrases verse 9. "Whether we live or whether we die, we are the Lord's" from verse 8 appears at the end of both verses in the hymn.
The line "That to new life He might arise again" near the beginning of the second verse may also be based on Romans 6:4: "We were buried therefore with him by baptism into death, in order that, just as Christ was raised from the dead by the glory of the Father, we too might walk in newness of life."
