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I took a peek inside my NIV Bible, looking for an explanation for what Jesus said in John 7. Here's what I found for 7:8.
Jesus was not refusing to go to the Feast, but refusing to go in the way the brothers suggested: as a pilgrim. When he went, it would be to deliver a prophetic message from God, for which he awaited the "right time" (v.6).
So no, He was not lying. Remember: He was, is and always will be sinless. Therefore, He is incapable of lying.