Was Jesus conscious of a previous existence?

To your question of his consciousness of a former existence, I may say that he himself declared to me that he had been on the earth before.

Though an old man, I still preach the same gospel.

Hafed, Prince of Persia—His Experiences in Earth Life and Spirit Life; being spirit communications received through Mr David Duguid, the Glasgow trance-painting medium; with an appendix, containing communications from the spirit artists, Ruisdal and Steen. Illustrated by facsimiles of various drawings and writings, the direct work of the spirits; David Duguid, Hay Nisbet; James Burns, London, 1876