Who was it that said, Whoever says they love god and hates his brother is a liar? Thought to have been written by John the evangelist in a letter, probably open, its purpose to evangelise, though the demonstration of the philosophy is effective. Salvation by good works is an early Christian theme.
John the evangelist is thought by some scholars to be the author of the gospel of John. Early manuscripts in Greek though Syriac is believed to be the language that Jesus spoke, being ancient Persian and believed to be a throwback to the Assyrian empires. Now it is mainly only spoken in some eastern Christian liturgies.
John was reportedly born in Golan. He is thought by scholars to have written the book of revelation while on the run. He was hiding from contingents of the Roman empire on the Greek island of Patmos at the time, and may not have been well. He isn’t believed to have been killed by the Roman empire unlike most of the others of Jesus’ inner circle. May have stayed on Patmos.