Hebrews 7:25, “Therefore He is also able to save to the uttermost those who come to God through Him, since He always lives to make intercession for them.”
Definition: “intercession” the action of intervening on behalf of another.
This is an excellent question. The questioner shows a true desire to harmonize the scriptures. Why would God (Jesus) have to speak to God (Jehovah) on our behalf?
The confusion begins with the incorrect belief that Jesus is also God.
The Apostles never thought that Jesus was God, but understood that Jesus was the Son of God. The concept of Jesus being God was a doctrine debated for many years. In 325 AD, the Roman emperor Constantine convened a council of church bishops at Nicaea (in modern-day western Turkey). The bishops were to resolve the conflict over whether Jesus was a created being or the same as God. In a compromise, these bishops decided God and Jesus were a duality. They coined a Greek word, “homo (same) – ousias (is-ness)”.
This new word could be interpreted both ways and satisfied both sides. Those who believed Jesus was created, still recognized Jesus as the “only begotten Son” (John 3:16) and as “the beginning of the creation of God” (Revelation 3:14). Additionally, they could recognize that Jesus was resurrected with God’s divine (2 Peter 1:4), spirit nature (the same “is”ness).The other sided said the word, homousias, meant Jesus and God were the same being. So it was about three hundred years after the death of Jesus when the doctrine of the God-hood of Jesus began.
By correctly believing (as the Apostles did) that Jesus was the Son of God, then Hebrews 7:25 beautifully shows that Jesus (the Son of God, our Redeemer) as our Advocate (1 John 2:1) pleads with God for us, using mercy, tolerance, and patience. He makes intercession to God for the sake of the Church.
“Who is he who condemns? It is Christ who died, and furthermore is also risen, who is even at the right hand of God, who also makes intercession for us.” Romans 8:34.