John 10:27-28: "27 'My sheep hear my voice, and I know them, and they follow me. 28 I give them eternal life, and they will never perish, and no one will snatch them out of my hand.'"
Psalm 23: "1 The LORD is my shepherd; I shall not want. 2 He makes me lie down in green pastures. He leads me beside still waters. 3 He restores my soul. He leads me in paths of righteousness for his name's sake.
"4 Even though I walk through the valley of the shadow of death, I will fear no evil, for you are with me; your rod and your staff, they comfort me.
"5 You prepare a table before me in the presence of my enemies; you anoint my head with oil; my cup overflows. 6 Surely goodness and mercy shall follow me all the days of my life, and I shall dwell in the house of the LORD forever."
Psalm 5:8: "Lead me, O LORD, in your righteousness because of my enemies; make your way straight before me."
Psalm 121:4-7: "4 Behold, he who keeps Israel will neither slumber nor sleep.
"5 The LORD is your keeper; the LORD is your shade on your right hand. 6 The sun shall not strike you by day, nor the moon by night.
"7 The LORD will keep you from all evil; he will keep your life. 8 The LORD will keep your going out and your coming in from this time forth and forevermore."
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The first three cited passages (John 10:27-28, Psalm 23, and Psalm 5:8) appear throughout the first verse and at the ends of the second and third ("For when Your hand is guiding, / In peace I go" and "So take my hand and lead me / Unto the end").
The passage from Psalm 121 appears in the lines "Direct, protect, and feed me / From day to day," specifically the "protect[ing]." The "feed[ing]" seems to come from Psalm 23:5.
The line "Without Your grace and favor / I go astray" in the first verse may come from the first part of Psalm 119:176 ("I have gone astray like a lost sheep...") or part of Isaiah 53:6 ("All we like sheep have gone astray..."), both of which use the same sheep imagery as Psalm 23 and John 10.
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The line "Close by Your side abiding" in the second verse exhibits internal rhyme, and this provides a sense of the constancy of "abiding."
