Are these scriptures?
And you also were included in Christ when you heard the word of truth, the gospel of your salvation. Having believed, you were marked in him with a seal, the promised Holy Spirit, who is a deposit guaranteeing our inheritance until the redemption of those who are Godโs possessionโto the praise of his glory. (Ephesians 1:13-14)
2 Cor. 1:21-22. Now it is God who makes both us and you stand firm in Christ. He anointed us, set his seal of ownership on us, and put his Spirit in our hearts as a deposit, guaranteeing what is to come.
Probably the clearest verses on eternal security are 2 Cor. 1:21-22 and Ephesians 1:13-14. These verses both say we received the seal of the Holy Spirit when we believed, as a deposit guaranteeing our inheritance. 2 Cor. 1:21-22 goes even further, saying that itโs God who makes us stand firm in Christ, and that He has set His mark of ownership on us. And Jesus said once we belong to Him no one can take us out of His or His fatherโs hands (John 10:27-30).
https://gracethrufaith.com/ask-a-bible-teacher/osas-2-peter-317/