After this I saw four angels standing at the four corners of the earth, holding back the four winds so that no wind should blow on the earth or the sea or against any tree. 1
References for Revelation 7:1
7.1 Jr 49.36; Dn 7.2; Zec 6.5.
And I saw another angel coming up from the east with the seal of the living God. He called out in a loud voice to the four angels to whom God had given the power to damage the earth and the sea.
The angel said, "Do not harm the earth, the sea, or the trees, until we mark the servants of our God with a seal on their foreheads." 2
References for Revelation 7:3
And I was told that the number of those who were marked with God's seal on their foreheads was 144,000. They were from the twelve tribes of Israel,
twelve thousand from each tribe: Judah, Reuben, Gad, Asher, Naphtali, Manasseh, Simeon, Levi, Issachar, Zebulun, Joseph, and Benjamin.