Any life-long Catholic, or Catholic convert, who is not in a state of grace and is guilty of unrepentant, unconfessed, or unforgiven mortal sin cannot receive communion.
I do recall that Jesus gave His apostles, and through them, the Church, the power to ‘bind and loose’. What is stated above is Catholic teaching and has been for centuries, as far back as written and oral records go. Jesus also didn’t tell us in so many words that the Father, Son, and Holy Spirit were three Divine Persons in one God. . .but unless you’re a unitarian, you probably believe they are. If you’re a Trinitarian, you are so because of the teaching of the Catholic Church through the power of the Spirit sent by Jesus, but not through the actual words in that statement of Jesus Himself.
Furthermore, any words of Jesus in Scripture that you have and believe as God-inspired inerrant Scripture you have through the canon of Scripture as established by the Catholic Church, not as dictated word-for-word by Jesus.
So if you want to stick for only believing in 'what Jesus said in the red words in the KJV", you still only get that through the Catholic Church.