Revelation 14

Then I looked, and behold, a Lamb standing on Mount Zion, and with Him one hundred and forty-four thousand, having His Father’s name written on their foreheads. v.1

Read chapter 14
God gives tattoos! Ok well we only see here in scripture of godly tattoos and it's the same tattoo in the same part of the body, God's name on their foreheads. Yet this isn't just a fad thing that all believers do, but these 144,000 are given it. This mark on them is in contrast from the mark of the beast. This is the same 144,000 in chapter seven we read about of Israel that they were sealed by Christ. These follow the Lamb, Christ, everywhere He goes so as to learn His ways and remember what they are to do for they sing a song that only they know. "They sang as it were a new song before the throne, before the four living creatures, and the elders; and no one could learn that song except the hundred and forty-four thousand who were redeemed from the earth" (v.3). This song is probably a teaching and it's a lot easier to remember something in song. We don't know the lyrics to the song yet, but will hear this song in tribulation. These 144,000 are without blemish in the Kingdom and through the time of the tribulation, sin is no longer working in every man at this time. We today as a special company of believers by faith and not by sight can expect as well that we'll be without blemish through the Kingdom and tribulation as well. The rest of this chapter continues with angels warning that the hour of God's judgment is near and the harvest of the faithful and the harvest of the rebels will be sickled out of the earth.
We realize that the idea of no godly people on the earth during the tribulation is just made up from movies, but the faithful to God during tribulation will be protected and given instruction. May you take God's instruction in His Word today of hard times you're facing as practice of living on God's words in the tribulation time as well.