"Do not labor for the food which perishes, but for the food which endures to everlasting life, which the Son of Man will give you, because God the Father has set His seal on Him.” (John 6:27)
There is salvation in no other, “… for there is no other name under heaven given among men by which we must be saved,” other than the name of Jesus.(Acts 4:12).
“In Him – Jesus, you also trusted, after you heard the word of truth, the gospel of your salvation; in whom also, having believed, you were sealed with the Holy Spirit of promise.” (Ephesians 1:13).
In Revelation 7, we saw where the angel put the mark of Jesus (the sealing) on the 144,000 witnesses. “After these things I saw four angels standing at the four corners of the earth, holding the four winds of the earth, that the wind should not blow on the earth, on the sea, or on any tree. Then I saw another angel ascending from the east, having the seal of the living God (which is Jesus). And he cried with a loud voice to the four angels to whom it was granted to harm the earth and the sea, saying, “Do not harm the earth, the sea, or the trees till we have sealed the servants of our God on their foreheads.” (Rev 7:1-3).