Romans 8:35-39: "35 Who shall separate us from the love of Christ? Shall tribulation, or distress, or persecution, or famine, or nakedness, or danger, or sword? 36 As it is written, 'For your sake we are being killed all the day long; we are regarded as sheep to be slaughtered.' 37 No, in all these things we are more than conquerors through him who loved us. 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."
Ephesians 1:4-6: "4 even as he chose us in him before the foundation of the world, that we should be holy and blameless before him. In love 5 he predestined us for adoption as sons through Jesus Christ, according to the purpose of his will, 6 to the praise of his glorious grace, with which he has blessed us in the Beloved."
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The text is public domain:
1 Through Jesus' blood and meritI am at peace with God.What, then, can daunt my spirit,However dark my road?My courage shall not fail me,For God is on my side;Though hell itself assail me,Its rage I may deride.2 There's nothing that can severFrom this great love of God;No want, no pain whatever,No famine, peril, flood.Though thousand foes surround me,For slaughter mark His sheep,They never shall confound me,The vict'ry I shall reap.3 For neither life's temptationNor death's most trying hourNor angels of high stationNor any other pow'rNor things that now are presentNor things that are to comeNor height, however pleasant,Nor darkest depths of gloom4 Nor any creature everShall from the love of GodThis ransomed sinner sever;For in my Savior's bloodThis love has its foundation;God hears my faithful prayerAnd long before creationNamed me His child and heir.
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The passage from Romans 8 is the main source for the hymn; verses 35-37 are paraphrased in the hymn's second verse, and verses 38-39 are paraphrased in the third verse and the first few lines of the fourth.
The passage from Ephesians 1 appears at the end of the fourth verse.
The line "Though thousand foes surround me" in the second verse may come from Psalm 3:6: "I will not be afraid of many thousands of people who have set themselves against me all around."