ALL believers are "sealed" with the Holy Spirit when they receive the Body and Blood of Yeshua/Jesus and are saved. However, the baptism with the Holy Spirit is different.
Next, is the "baptism" with the Holy Spirit which is the first time we are "filled" with the Holy Spirit and become the Temple of the Holy Spirit being indwelt.
Lastly, we are to be "continually filled" with the Holy Spirit by reading and meditating on scriptures of God's Word the Bible, praying, singing songs in our hearts to God, worshiping God in Spirit and in Truth, enjoying fellowship with other believers, etc..
After Solomon built the Temple and the Ark of the Covenant was placed in the Holy of Holies and the priests were leaving the Temple, God filled the Temple with His Glory Cloud. The same happens to us. We are sealed when we are saved and set apart and dedicated for God's purposes, but God filling His Temple (us) is the "Baptism" with the Holy Spirit.
1 Kings 8:10-11 King James Version (KJV)
10 And it came to pass, when the priests were come out of the holy place, that the cloud filled the house of the Lord,
11 So that the priests could not stand to minister because of the cloud: for the glory of the Lord had filled the house of the Lord.
If we neglect the Gift of the Holy Spirit within us, or defile our bodies which are the temple of the Holy Spirit, it grieves the Holy Spirit and our flesh gets stronger and we backslide. The Holy Spirit never leaves us, we need to learn to walk by the Spirit so we do not fulfill the lusts of the flesh.