What was the source of the concept "The Word was God " that John the Evangelist introduced in Jn 1: 1?

We read in John 1:1-2: > In the beginning was the Word, and the Word was with God, and the Word was God. He was in the beginning with God. Clearly, John means The Son of God for “the Word who was with God”, as is evident from Vs 1:2. No other Evangelist uses the concept of "The Word was God "; neither do we hear Jesus referring to himself as "The Word". Of course, he speaks of the words from the mouth of God, as in Matthew 4:4: > But he answered and said, it is written, Man shall not live by bread alone, but by every word that proceedeth out of the mouth of God. Now, there is a difference between Word that proceeds from God' and Word that was God'. Is it possible that John sourced the concept from an ancient Jewish text, or from Greek philosophy? My question therefore is: **According to Catholic Church, what was the source of the concept "The Word was God " that John the Evangelist introduced in Jn 1: 1?**