The primary Bible verse that directly uses the phrase or concept of being "conformed to the image of God" (or the image of His Son, Jesus Christ) is found in Romans 8:29:

"For those God foreknew he also predestined to be conformed to the image of his Son, that he might be the firstborn among many brothers and sisters."

The foundational concept of humanity being created in the image and likeness of God is also written in Genesis 1:26-27:

"Then God said, 'Let us make mankind in our image, in our likeness, so that they may rule over the fish in the sea and the birds in the sky, over the livestock and all the wild animals, and over all the creatures that move along the ground.' So God created mankind in his own image, in the image of God he created them; male and female he created them."

Several supporting verses reinforce the meaning of spiritual renewal to become increasingly like the image of the Creator:

• Colossians 3:10 — "And have put on the new self, which is being renewed in knowledge in the image of its Creator."
• 2 Corinthians 3:18 — "And we all, who with unveiled faces contemplate the Lord's glory, are being transformed into his image with ever-increasing glory, which comes from the Lord, who is the Spirit."
• Ephesians 4:23-24 — "To be made new in the attitude of your minds; and to put on the new self, created to be like God in true righteousness and holiness."