1 John 3:5

And ye know that he was manifested to take away sins; and in him is no sin.

In him is no sin ... Even the sins of Christians who are "in Christ" are cleansed automatically by the blood of Christ as long as they so remain. There is no compatibility whatever between Christ and sin.

He was manifested to take away sins ... For more on what Christ came into our world to do, see under 1 Peter 1:19.

And in him is no sin ... Although in the present tense and bearing the meaning noted above, this is also true in the past tense of our Lord Jesus Christ. Jesus committed no sin (1 Peter 2:22); he was holy, guileless, undefiled, and separated from sinners (Hebrews 7:26); he knew no sin (2 Corinthians 5:21); he was without blemish and without spot (1 Peter 1:19), etc.