Revelation 7:2-4 Amplified Bible (AMP)
2 Then I saw another angel coming up from the rising of the sun, holding the seal of the living God; and with a loud voice he called out to the four angels to whom it was granted [to have authority and power] to harm the earth and the sea, 3 saying, “Do not harm the earth nor the sea nor the trees until we [a]seal (mark) the bond-servants of our God on their foreheads.”
4 And I heard how many were sealed, a hundred and forty-four thousand; [twelve thousand] sealed from [b]every tribe of the sons of Israel:
Revelation 7:2-4 New International Version (NIV)
2 Then I saw another angel coming up from the east, having the seal of the living God. He called out in a loud voice to the four angels who had been given power to harm the land and the sea: 3 “Do not harm the land or the sea or the trees until we put a seal on the foreheads of the servants of our God.” 4 Then I heard the number of those who were sealed: 144,000 from all the tribes of Israel.