By Andae Lisborn
Prosecutors said Peter Farquhar, 69, died in October 2015 after being suffocated by Mr Field, who he had been in a relationship with.
A jury of six men and six women at Oxford Crown Court were shown pictures of the messages, which Field took himself. He and Martyn Smith, 32, are on trial for attempted murder of another pensioner and neighbor.
Prosecuting officer Oliver Saxby QC said: “Field and Smith embarked on a campaign of ‘mirror writing’. That is to say, using a white marker such as is used on boards outside restaurants, they wrote things – messages – on Moore-Martin’s mirrors at home.
“These messages were biblical in nature and Moore-Martin ended up believing they were messages from God – Field would speak of having received them too.
“Among other things, the messages were telling Moore-Martin to leave Field her house, that if she did, she would be doing the will of the Lord. Which is what she duly did.”
The court heard Moore-Martin contacted her lawyer to make Field a benefactor to her will, citing the mirror writings as a reason for her decision.
High Court judge Mr Justice Sweeney was told the lawyer expressed her concerns but the woman changed her will nonetheless.
Field is charged with one count of murder, one count of attempted murder, one count of conspiracy to murder, one count of burglary, three counts of fraud and one count of possession of an article for use in fraud.
He has admitted the three fraud counts and the burglary.