"And to the angel of the church in Philadelphia write : He who is holy, who is true, who has the key of David, who opens and no one will shut, and who shuts and no one opens, says this : 'I know your deeds. Behold I have put before you an open door which no one can shut, because you have a little power, and have kept My word, and have not denied My name. Behold I will cause those of the synagogue of Satan, who say that they are Jews, and are not, but lie - behold, I will make them to come and bow down at your feet, and to know that I have loved you. Because you have kept the word of My perseverance, I also will keep you from the hour of testing, that hour which is about to come upon the whole world, to test those who dwell upon the earth. I am coming quickly; hold fast what you have, in order that no one take your crown. He who overcomes, I will make him a pillar in the temple of My God, and he will not go out from it any more; and I will write upon him the name of My God, and the name of the city of My God, the new Jerusalem, which comes down out of heaven from My God, and My new name. He who has an ear, let him hear what the Spirit says to the churches." (Rev.3:7-13).
The Lord's promise to the church in Philadelphia was, "I will keep you from the hour of testing that is about to come upon the whole world" (Rev 3:10). Here the Lord warns them in advance of a time of trial that was going to come upon the whole world at that time (at the end of the first century or in the early second century). The church in Philadelphia was promised Divine protection during that time of testing. How did the Lord "keep them from that hour of testing"? It was certainly not by rapturing them out of the world. No. They were KEPT SAFE IN THE MIDST OF THE TRIAL. They experienced the Lord's protecting hand in the midst of their tribulations.
This is a word of encouragement for us too - for the Lord will similarly keep us also safe from evil in the midst of the great tribulation during the time of the Antichrist. He will keep us exactly as He kept the church in Philadelphia in the second century - on earth, safe from evil, even though we may have to suffer for His Name's sake. Jesus has said, "You will be hated by all on account of my Name.....but do not fear those who kill the body.......for the very hairs of your head are all numbered.....Not a hair of your head will perish" (Mt.10:28,30; Lk.21:18). Even during the tribulation, not a hair on our head can be touched by anyone without the Lord's permission. So we can be at rest.
The Lord then tells the church at Philadelphia that those who are going to be tested during "the hour of testing", are "the earth-dwellers" - those who have made this earth their home, whose minds are set on earthly things, and who pursue after wealth and seek the honour of men (Rev 3:10). No overcomer is such an earth-dweller, for His mind is set on the things that are above.
The Lord goes on to tell the church here to hold fast to what they have until He comes back to earth, so that they may not lose their crown (Rev 3:10). It is possible therefore for someone else to get the crown that God meant for you. God has planned a task and a crown for you. But if you are unfaithful in fulfilling that task, you won't get that crown. God will raise up someone else to fulfil that task and he will get the crown that was meant for you. This is a real possibility. So we must be watchful. God had planned a specific task for Judas Iscariot, just as He had planned tasks for the other apostles of Christ. But Judas was unfaithful. So he lost his crown. Someone else (perhaps Paul) fulfilled the task that Judas was to have fulfilled. That person will now get Judas' crown in addition to his own. We have to hold fast what God has given us. We cannot afford to take things easy at any time.
The overcomer will be made a permanent pillar in the church (Rev 3:12). What that means is that he will be a support to others in the church, bearing their burdens. He will be a spiritual "father" to others. In every church there is a great need for such pillars.
The overcomer will have the name of God, the name of the New Jerusalem and the Lord's new name written on his forehead. In other words, he will be publicly identified as a wholehearted disciple of Jesus, wherever He goes. This will lead to his being despised on earth now, but honoured by the Lord when He returns.