“And David spake unto the LORD the words of this song in the day that the LORD had delivered him out of the hand of all his enemies, and out of the hand of Saul" (II Samuel 22:1).

“Be sober, be vigilant; because your adversary the devil, as a roaring lion, walketh about, seeking whom he may devour" (I Peter 5:8).

“In the beginning was the Word, and the Word was with God, and the Word was God. The same was in the beginning with God. All things were made by Him; and without Him was not anything made that was made" (John 1:1–3).

“If any man among you seem to be religious, and bridleth not his tongue, but deceiveth his own heart, this man’s religion is vain" (James 1:26).

In the next-to-last book of the Bible, the apostle Jude exhorts us to "earnestly contend for the faith which was once delivered to the saints" (Jude 3). His warning refers primarily to professing Christians who would dilute the faith instead of defending it.