The Elect, or Chosen are sealed with the Holy Spirit of promise of redemption. The 144,000 Servants are Redeemed, and sealed with the Name of the Father.
Ephesians 1:13 In Him 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 1:14 who is the guarantee of our inheritance until the redemption
of the purchased possession, to the praise of His glory.
Rev 7:3 saying, "Do not harm the earth, the sea, or the trees till we have sealed the servants of our God on their foreheads.
Rev 14:1 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.
Rev 14:4 These are the ones who were not defiled with women, for they are virgins. These are the ones who follow the Lamb wherever He goes. These were redeemed
from among men, being firstfruits to God and to the Lamb.