Most translations read '(But he was lying to him)'. I always thought the Old Prophet lied to the man of God, but now I'm wondering if the 'angel' lied to the old prophet.
This wondering started when reading Systematic Theology, Wayne Grudem chapter 19 Angels pp. 406-407. 1 Kings 13.18 is used as an example of 'false doctrine or guidance being conveyed by angels ... the clear possibility of satanic deception tempting us to disobey ...'
Having investigated, some translations put 'the old prophet lied' which makes it clear (if they are correct??). Any gentle help appreciated.