1 John 2:19 *They went out from us, but they were not of us; for if they had been of us, they would have continued with us. But they went out, that it might become plain that they all are not of us. *
The first characteristic mentioned of antichrists, i.e., false teachers and deceivers, is that they depart from the faithful. They arise from within the church and depart from true fellowship and lead people out with them. The verse also places emphasis on the doctrine of the perseverance of the saints. Those genuinely born again endure in faith and fellowship and the truth (1 Corinthians 11:19; 2 Timothy 2:12). The ultimate test of true Christianity is endurance (Mark 13:13; Hebrews 3:14). The departure of people from the truth and the church is their unmasking.