Jesus is the “exact representation of God’s nature” (Hebrews 1:3).

Some of the various translations of Hebrews 1:3 are below.
Some examples of translations include:
Jesus is the exact imprint of God’s nature
He is the exact likeness of God’s being.

Other translations:

“He is the radiance of the glory of God and the exact imprint of his nature” (ESV).

“The Son is the radiance of God’s glory and the exact representation of His nature” (Berean Study & others).

“His Son . . . [is] . . . the radiance of His glory and the exact expression of His substance” (Berean Literal).

“God’s Son has all the brightness of God’s own glory and is like him in every way” (Good News).

“Who being the brightness of his glory” (KJV)

“For he is the Brilliance of his glory” (Aramaic Bible)

“His Son is the reflection of God’s glory” (GWT).

“He is the reflection of God’s glory and the exact likeness of his being” (ISV).

“The Son is the radiance of his glory and the representation of his essence” (NET).

“He brightly reflects God’s glory and is the exact representation of His being” (Weymouth).

God . . . has in these last days spoken to us by His Son, whom He has appointed heir of all things, through whom also He made the worlds; who being the brightness of His glory and the express image of His person, and upholding all things by the word of His power, when He had by Himself purged our sins, sat down at the right hand of the Majesty on high, having become so much better than the angels, as He has by inheritance obtained a more excellent name than they (Hebrews 1:1-4).