Matthew 10:33
New King James Version.

But whoever denies Me before men, him I will also deny before My Father who is in heaven.

Let us not enter upon the enemy’s ground by concealing our belief in the Son of God:
“The disciple John, upon entering the judgment hall, did not try to conceal the fact that he was one of the followers of Jesus. He did not mingle with the rough company that were insulting and mocking his Master. He was not questioned, for he did not assume a false character and thus lay himself liable to suspicion. He sought a retired corner secure from observation of the mob, but as near Jesus as it was possible for him to be. In this place he could hear and see all that transpired at the trial of his Lord.
If Peter had been called to fight for his Master, he would have proved a bold and courageous soldier; but he became a coward when the finger of scorn was pointed at him. Many who do not hesitate to engage in active warfare for the Lord, are driven to deny their faith through the ridicule of their enemies. They place themselves in the way of temptation by associating with those whom they should avoid. They thus invite the enemy to tempt them, and are led to do and say that which they would never have been guilty of under other circumstances. The disciple of Christ, who, in our day, disguises his faith through dread of suffering or reproach, denies his Lord as virtually as did Peter in the judgment hall.” 3SP 112.1-3SP 112.2