No - I don't need to provide citations for widely publicized, factual information.
But why don't you take Khamenei's own words, literally from his Twitter account: "Our stance against Israel is the same stance we have always taken. #Israel is a malignant cancerous tumor in the West Asian region that has to be removed and eradicated: it is possible and it will happen." [1]
Or a random sampling of the same stated objective through the times:
"Israel should be wiped off map, says Iran's president" - The Guardian [2]
"Referring to comments by Ayatollah Ruhollah Khomeini, the leader of the Islamic revolution, Admadinejad said, "As the imam said, Israel must be wiped off the map."" - NY Times [3]
"Brigadier General Mohammad Reza Naqdi, who leads the Basij volunteer force, made the declaration to mark Islamic Republic Day in Tehran on Tuesday. “Wiping Israel off the map is not up for negotiation,”" The Independent [4]
This is not a single statement or an off-hand remark - it's made consistently, publicly and empathetically by many representatives of the Iranian regime, without retraction or contextualisation afterwards, throughout the entire history of the regime.
These statements must be taken as a credible articulation of the objectives of Iran - and considered in the context of their goals of obtaining nuclear weapons.
As for the article, I would love to visit Iran, but they are grabbing Western tourists willy nilly, accusing them of being spies etc., so that won't be happening.
