You find it throughout Scripture.
John 15:26 "But when the Helper comes, whom I shall send to you from the Father, the Spirit of truth who proceeds from the Father, He will testify of Me.
John 8:42 Jesus said to them, If God were your Father, you would love Me, For I proceeded forth and came from God; nor have I come of Myself, but he sent Me.
John 10:30 I and My Father are one.
“Where is the Trinty in Scripture?
You find it throughout Scripture.”
That’s another discussion. Yes, I believe in the Triune God, but in the Scripture it is NOT elaborated.
Let’s stick to Mary.