Isaiah 48:16
Come ye near unto me, hear ye this; I have not spoken in secret from the beginning; from the time that it was, there am I: and now the Lord God, and his Spirit, hath sent me.
Cross-reference
Isaiah 48:3-6 emphasizes God declaring things from the beginning — directly parallel to v16's claim of not speaking in secret.
Isaiah 45:19 states God did not speak in secret — almost identical language reinforcing the open declaration theme.
In Isaiah 61:1-3, the same Spirit-sent messenger appears, anointed to bring good news — a direct parallel to the sending with the Spirit in 48:16.
In Luke 4:18, Jesus claims the Spirit-anointed role by reading Isaiah 61, fulfilling the sending with the Spirit seen in 48:16.
In John 3:34, the sent one speaks God's words and receives the Spirit without limit, directly mirroring the sending with the Spirit in 48:16.
John 18:20 has Jesus saying 'I spoke openly... in secret I have said nothing' — fulfilling the Servant's claim of public teaching.
In Zechariah 2:8-11, a sent figure also speaks of being sent by the Lord of hosts, echoing the sending motif found in 48:16.