Seal on the Foreheads

Revelation 7:3
"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."

Revelation 9:4
They were told not to harm the grass of the earth or any plant or tree, but only those people who did not have the seal of God on their foreheads.

Ezekiel 9:4
and said to him, "Go throughout the city of Jerusalem and put a mark on the foreheads of those who grieve and lament over all the detestable things that are done in it."