But to you who fear My name The Sun of Righteousness shall arise With healing in His wings; And you shall go out And grow fat like stall-fed calves.. Malachi 4:2 (NKJV)
The sun as a source of light makes things visible. Christ Jesus is the Sun of Righteousness. He is the revelation of the Righteousness of God.
He died on account of our unrighteousness but He arose from the dead when and because we were made the Righteousness of God. Romans 4:25.
The light rays of the sun are called its wings. The Sun of Righteousness shall arise With healing in His wings means the light or knowledge or understanding of Jesus Christ as our Righteousness brings healing. When we know we have been made right with God, we know we have been made whole. We live whole.