John 6:35: "Jesus said to them, 'I am the bread of life; whoever comes to me shall not hunger, and whoever believes in me shall never thirst.'"
Matthew 11:28-29: "28 'Come to me, all who labor and are heavy laden, and I will give you rest. 29 Take my yoke upon you, and learn from me, for I am gentle and lowly in heart, and you will find rest for your souls.'"
John 7:37: "On the last day of the feast, the great day, Jesus stood up and cried out, 'If anyone thirsts, let him come to me and drink.'"
John 8:12: "Again Jesus spoke to them, saying, 'I am the light of the world. Whoever follows me will not walk in darkness, but will have the light of life.'"
+++
The text is public domain:
1 I heard the voice of Jesus say,"Come unto Me and rest;Lay down, thou weary one, lay downThey head upon My breast."I came to Jesus, as I was,So weary, worn, and sad;I found in Him a resting place,And He has made me glad.2 I heard the voice of Jesus say,"Behold, I freely giveThe living water; thirsty one,Stoop down and drink and live."I came to Jesus, and I drankOf that life-giving stream;My thirst was quenched, my soul revived,And now I live in Him.3 I heard the voice of Jesus say,"I am this dark world's light.Look unto Me; thy morn shall riseAnd all thy day be bright."I looked to Jesus, and I foundIn Him my star, my sun;And in that light of life I'll walkTill trav'ling days are done.
+++
The hymn's first verse is drawn from Matthew 11:28-29, and the third verse is drawn from John 8:12. John 6:35 and 7:37 could be cited for the second verse, but the phrase "living water" seems to indicate John 4 as the source, specifically verses 10 and 14: "10 Jesus answered her, 'If you knew the gift of God, and who it is that is saying to you, "Give me a drink," you would have asked him, and he would have given you living water. ... 14 but whoever drinks of the water that I will give him will never be thirsty again. The water that I will give him will become in him a spring of water welling up to eternal life.'"